Look for final impl when accessing associated constant in facet (#5269)

While facets may come with a rewrite for an associated constant, they
are symbolic. A final impl has the ability to provide a concrete value
instead, which allows generic code to use the concrete value in place of
the associated constant's (fully qualified) name.

For instance, instead of `I.Type`, the concrete type `()` can be used if
there is an `impl final [T:! type] T as I where .Type = ()` impl.

This does not yet cache the result of the lookups.

Depends on https://github.com/carbon-language/carbon-lang/pull/5255

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

toolchain/check/BUILD

@@ -29,6 +29,7 @@ cc_library(
         "function.cpp",
         "generic.cpp",
         "global_init.cpp",
+        "impl.cpp",
         "impl_lookup.cpp",
         "import.cpp",
         "import_cpp.cpp",
@@ -68,6 +69,7 @@ cc_library(
         "function.h",
         "generic.h",
         "global_init.h",
+        "impl.h",
         "impl_lookup.h",
         "import.h",
         "import_cpp.h",
@@ -166,7 +168,6 @@ cc_library(
         ":context",
         ":diagnostic_emitter",
         ":dump",
-        ":impl",
         ":pointer_dereference",
         "//common:check",
         "//common:error",
@@ -223,21 +224,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "impl",
-    srcs = ["impl.cpp"],
-    hdrs = ["impl.h"],
-    deps = [
-        ":context",
-        "//common:check",
-        "//toolchain/base:kind_switch",
-        "//toolchain/diagnostics:diagnostic_emitter",
-        "//toolchain/sem_ir:file",
-        "//toolchain/sem_ir:inst",
-        "//toolchain/sem_ir:typed_insts",
-    ],
-)
-
 cc_library(
     name = "node_stack",
     srcs = ["node_stack.cpp"],

toolchain/check/handle_impl.cpp

@@ -364,11 +364,12 @@ static auto BuildImplDecl(Context& context, Parse::AnyImplDeclId node_id,
 
   // Process modifiers.
   // TODO: Should we somehow permit access specifiers on `impl`s?
-  // TODO: Handle `final` modifier.
   auto introducer =
       context.decl_introducer_state_stack().Pop<Lex::TokenKind::Impl>();
   LimitModifiersOnDecl(context, introducer, KeywordModifierSet::ImplDecl);
 
+  bool is_final = introducer.modifier_set.HasAnyOf(KeywordModifierSet::Final);
+
   // Finish processing the name, which should be empty, but might have
   // parameters.
   auto name_context = context.decl_name_stack().FinishImplName();
@@ -387,7 +388,8 @@ static auto BuildImplDecl(Context& context, Parse::AnyImplDeclId node_id,
                            {.self_id = self_inst_id,
                             .constraint_id = constraint_inst_id,
                             .interface = CheckConstraintIsInterface(
-                                context, impl_decl_id, constraint_inst_id)}};
+                                context, impl_decl_id, constraint_inst_id),
+                            .is_final = is_final}};
   // Add the impl declaration.
   bool invalid_redeclaration = false;
   auto lookup_bucket_ref = context.impls().GetOrAddLookupBucket(impl_info);

toolchain/check/impl.cpp

@@ -249,4 +249,10 @@ auto FillImplWitnessWithErrors(Context& context, SemIR::Impl& impl) -> void {
   }
 }
 
+auto IsImplEffectivelyFinal(Context& context, const SemIR::Impl& impl) -> bool {
+  return impl.is_final ||
+         (context.constant_values().Get(impl.self_id).is_concrete() &&
+          context.constant_values().Get(impl.constraint_id).is_concrete());
+}
+
 }  // namespace Carbon::Check

toolchain/check/impl.h

@@ -26,6 +26,10 @@ auto FinishImplWitness(Context& context, SemIR::Impl& impl) -> void;
 // Sets all unset members of the witness for `impl` to the error instruction.
 auto FillImplWitnessWithErrors(Context& context, SemIR::Impl& impl) -> void;
 
+// Returns whether the impl is either `final` explicitly, or implicitly due to
+// being concrete.
+auto IsImplEffectivelyFinal(Context& context, const SemIR::Impl& impl) -> bool;
+
 }  // namespace Carbon::Check
 
 #endif  // CARBON_TOOLCHAIN_CHECK_IMPL_H_

toolchain/check/impl_lookup.cpp

@@ -12,6 +12,7 @@
 #include "toolchain/check/diagnostic_helpers.h"
 #include "toolchain/check/eval.h"
 #include "toolchain/check/generic.h"
+#include "toolchain/check/impl.h"
 #include "toolchain/check/import_ref.h"
 #include "toolchain/check/inst.h"
 #include "toolchain/check/type.h"
@@ -220,6 +221,7 @@ static auto GetWitnessIdForImpl(Context& context, SemIR::LocId loc_id,
     // DeduceImplArguments can import new impls which can invalidate any
     // pointers into `context.impls()`.
     const SemIR::Impl& impl = context.impls().Get(impl_id);
+
     if (impl.generic_id.has_value()) {
       specific_id =
           DeduceImplArguments(context, loc_id,
@@ -290,11 +292,12 @@ static auto GetWitnessIdForImpl(Context& context, SemIR::LocId loc_id,
     ResolveSpecificDefinition(context, loc_id, specific_id);
   }
 
-  bool impl_is_effectively_final =
-      // TODO: impl.is_final ||
-      (context.constant_values().Get(impl.self_id).is_concrete() &&
-       context.constant_values().Get(impl.constraint_id).is_concrete());
-  if (query_is_concrete || impl_is_effectively_final) {
+  if (query_is_concrete || IsImplEffectivelyFinal(context, impl)) {
+    // TODO: These final results should be cached somehow. Positive (non-None)
+    // results could be cached globally, as they can not change. But
+    // negative results can change after a final impl is written, so
+    // they can only be cached in a limited way, or the cache needs to
+    // be invalidated by writing a final impl that would match.
     return EvalImplLookupResult::MakeFinal(
         context.constant_values().GetInstId(SemIR::GetConstantValueInSpecific(
             context.sem_ir(), specific_id, impl.witness_id)));
@@ -340,9 +343,9 @@ static auto FindWitnessInFacet(
 // if not, it will evaluate to itself as a symbolic witness to be further
 // evaluated with a more specific query when building a specific for the generic
 // context the query came from.
-static auto FindWitnessInImpls(Context& context, SemIR::LocId loc_id,
-                               SemIR::ConstantId query_self_const_id,
-                               SemIR::SpecificInterface interface)
+static auto GetOrAddLookupImplWitness(Context& context, SemIR::LocId loc_id,
+                                      SemIR::ConstantId query_self_const_id,
+                                      SemIR::SpecificInterface interface)
     -> SemIR::InstId {
   auto witness_const_id = EvalOrAddInst(
       context, loc_id.ToImplicit(),
@@ -434,9 +437,12 @@ auto LookupImplWitness(Context& context, SemIR::LocId loc_id,
     // do an O(N+M) merge instead of O(N*M) nested loops.
     auto result_witness_id =
         FindWitnessInFacet(context, loc_id, query_self_const_id, interface);
+    // TODO: If the impl lookup finds a final impl, it should take precedence
+    // over the witness from the facet value. See the test:
+    // fail_todo_final_impl_precidence_over_facet_value.carbon.
     if (!result_witness_id.has_value()) {
-      result_witness_id =
-          FindWitnessInImpls(context, loc_id, query_self_const_id, interface);
+      result_witness_id = GetOrAddLookupImplWitness(
+          context, loc_id, query_self_const_id, interface);
     }
     if (result_witness_id.has_value()) {
       result_witness_ids.push_back(result_witness_id);
@@ -491,11 +497,16 @@ struct CandidateImpl {
 
 // Returns the list of candidates impls for lookup to select from.
 static auto CollectCandidateImplsForQuery(
-    Context& context, const TypeStructure& query_type_structure,
+    Context& context, bool final_only,
+    const TypeStructure& query_type_structure,
     SemIR::SpecificInterface& query_specific_interface)
     -> llvm::SmallVector<CandidateImpl> {
   llvm::SmallVector<CandidateImpl> candidate_impls;
   for (auto [id, impl] : context.impls().enumerate()) {
+    if (final_only && !IsImplEffectivelyFinal(context, impl)) {
+      continue;
+    }
+
     // If the impl's interface_id differs from the query, then this impl can
     // not possibly provide the queried interface.
     if (impl.interface.interface_id != query_specific_interface.interface_id) {
@@ -593,7 +604,8 @@ auto EvalLookupSingleImplWitness(Context& context, SemIR::LocId loc_id,
       QueryIsConcrete(context, query_self_const_id, query_specific_interface);
 
   auto candidate_impls = CollectCandidateImplsForQuery(
-      context, query_type_structure, query_specific_interface);
+      context, /*final_only=*/false, query_type_structure,
+      query_specific_interface);
 
   for (const auto& candidate : candidate_impls) {
     // In deferred lookup for a symbolic impl witness, while building a
@@ -619,4 +631,48 @@ auto EvalLookupSingleImplWitness(Context& context, SemIR::LocId loc_id,
   return EvalImplLookupResult::MakeNone();
 }
 
+auto LookupFinalImplWitnessForSpecificInterface(
+    Context& context, SemIR::LocId loc_id,
+    SemIR::ConstantId query_self_const_id,
+    SemIR::SpecificInterface query_specific_interface) -> SemIR::InstId {
+  // This would mean we need to UnwrapFacetAccessType(query_self_const_id), but
+  // it's already done by member access, which is the one use of this function.
+  CARBON_DCHECK(!context.insts().Is<SemIR::FacetAccessType>(
+      context.constant_values().GetInstId(query_self_const_id)));
+
+  auto query_type_structure = BuildTypeStructure(
+      context, context.constant_values().GetInstId(query_self_const_id),
+      query_specific_interface);
+  bool query_is_concrete =
+      QueryIsConcrete(context, query_self_const_id, query_specific_interface);
+
+  auto candidate_impls = CollectCandidateImplsForQuery(
+      context, /*final_only=*/true, query_type_structure,
+      query_specific_interface);
+
+  for (const auto& candidate : candidate_impls) {
+    // In deferred lookup for a symbolic impl witness, while building a
+    // specific, there may be no stack yet as this may be the first lookup. If
+    // further lookups are started as a result in deduce, they will build the
+    // stack.
+    //
+    // NOTE: Don't retain a reference into the stack, it may be invalidated if
+    // we do further impl lookups when GetWitnessIdForImpl() does deduction.
+    if (!context.impl_lookup_stack().empty()) {
+      context.impl_lookup_stack().back().impl_loc = candidate.loc_inst_id;
+    }
+
+    // NOTE: GetWitnessIdForImpl() does deduction, which can cause new impls
+    // to be imported, invalidating any pointer into `context.impls()`.
+    auto result = GetWitnessIdForImpl(
+        context, loc_id, query_is_concrete, query_self_const_id,
+        query_specific_interface, candidate.impl_id);
+    if (result.has_value()) {
+      CARBON_CHECK(result.has_concrete_value());
+      return result.concrete_witness();
+    }
+  }
+  return SemIR::InstId::None;
+}
+
 }  // namespace Carbon::Check

toolchain/check/impl_lookup.h

@@ -97,6 +97,18 @@ auto EvalLookupSingleImplWitness(Context& context, SemIR::LocId loc_id,
                                  SemIR::LookupImplWitness eval_query)
     -> EvalImplLookupResult;
 
+// Looks for a witness of a _final_ impl declaration. Since only final impls are
+// returned, it always returns a concrete ImplWitness or None, it will never
+// return a symbolic LookupImplWitness instruction.
+//
+// Generally prefer to call LookupImplWitness(). This method is used to look for
+// a final specialization in order to get concrete associated constants in
+// generic contexts.
+auto LookupFinalImplWitnessForSpecificInterface(
+    Context& context, SemIR::LocId loc_id,
+    SemIR::ConstantId query_self_const_id,
+    SemIR::SpecificInterface query_specific_interface) -> SemIR::InstId;
+
 }  // namespace Carbon::Check
 
 #endif  // CARBON_TOOLCHAIN_CHECK_IMPL_LOOKUP_H_

toolchain/check/member_access.cpp

@@ -176,6 +176,27 @@ static auto AccessMemberOfImplWitness(Context& context, SemIR::LocId loc_id,
                                                  .index = assoc_entity->index});
 }
 
+// For an impl lookup query with a single interface in it, we can convert the
+// result to a single witness InstId.
+//
+// This CHECKs that the result (and thus the query) was a single interface. This
+// generally only makes sense in member access, where the lookup query's
+// interface is found through name lookup, and we don't have an arbitrary
+// `FacetType`.
+static auto GetWitnessFromSingleImplLookupResult(
+    Context& context, SemIR::InstBlockIdOrError lookup_result)
+    -> SemIR::InstId {
+  auto witness_id = SemIR::InstId::None;
+  if (lookup_result.has_error_value()) {
+    witness_id = SemIR::ErrorInst::SingletonInstId;
+  } else {
+    auto witnesses = context.inst_blocks().Get(lookup_result.inst_block_id());
+    CARBON_CHECK(witnesses.size() == 1);
+    witness_id = witnesses[0];
+  }
+  return witness_id;
+}
+
 // Performs impl lookup for a member name expression. This finds the relevant
 // impl witness and extracts the corresponding impl member.
 static auto PerformImplLookup(
@@ -210,18 +231,8 @@ static auto PerformImplLookup(
     return SemIR::ErrorInst::SingletonInstId;
   }
 
-  // The query facet type given to `LookupImplWitness()` had only a single
-  // interface in it, so the returned witness set will have the same. Convert
-  // from the InstBlockId to the single ImplWitness instruction.
-  auto witness_id = SemIR::InstId::None;
-  if (lookup_result.has_error_value()) {
-    witness_id = SemIR::ErrorInst::SingletonInstId;
-  } else {
-    auto witnesses = context.inst_blocks().Get(lookup_result.inst_block_id());
-    CARBON_CHECK(witnesses.size() == 1);
-    witness_id = witnesses[0];
-  }
-
+  auto witness_id =
+      GetWitnessFromSingleImplLookupResult(context, lookup_result);
   return AccessMemberOfImplWitness(context, loc_id, self_type_id, witness_id,
                                    assoc_type.interface_specific_id, member_id);
 }
@@ -303,26 +314,59 @@ static auto LookupMemberNameInScope(Context& context, SemIR::LocId loc_id,
 
         auto assoc_interface = assoc_type->GetSpecificInterface();
 
-        // First look for `assoc_interface` in the type of the base. If it is
-        // found, get the witness that the interface is implemented from
-        // `base_id`.
-        auto identified_id = RequireIdentifiedFacetType(context, *facet_type);
-        const auto& identified =
-            context.identified_facet_types().Get(identified_id);
         // Witness that `T` implements the `assoc_interface`.
         SemIR::InstId witness_inst_id = SemIR::InstId::None;
-        for (auto [index, base_interface] :
-             llvm::enumerate(identified.required_interfaces())) {
-          // Get the witness that `T` implements `base_type_id`.
-          if (base_interface == assoc_interface) {
-            witness_inst_id = GetOrAddInst(
-                context, loc_id,
-                SemIR::FacetAccessWitness{
-                    .type_id = GetSingletonType(
-                        context, SemIR::WitnessType::SingletonInstId),
-                    .facet_value_inst_id = base_id,
-                    .index = SemIR::ElementIndex(index)});
-            break;
+
+        bool is_lookup_in_period_self = false;
+        if (auto name = context.insts().TryGetAs<SemIR::NameRef>(base_id)) {
+          if (name->name_id == SemIR::NameId::PeriodSelf) {
+            is_lookup_in_period_self = true;
+          }
+        }
+
+        // TODO: In `.Self` we want to find the witness through its FacetType,
+        // which is the code below this block. Instead of special-casing that
+        // here, we could have the impl lookup also include witnesses
+        // (FacetAccessWitness) from the FacetType? And even non-final results.
+        // Then we just call into lookup once here, for `.Self` or otherwise,
+        // and can drop the construction of FacetAccessWitness from this
+        // function, and resolve TODO below that for "associated entity not
+        // found in facet type".
+        if (!is_lookup_in_period_self) {
+          // For an associated constant value, we need to do impl lookup to try
+          // find a final impl declaration. If we find one, we can use the value
+          // assigned to the constant there, instead of its symbolic value.
+          auto assoc_entity = context.insts().GetAs<SemIR::AssociatedEntity>(
+              context.constant_values().GetConstantInstId(
+                  result.scope_result.target_inst_id()));
+          if (context.insts().Is<SemIR::AssociatedConstantDecl>(
+                  assoc_entity.decl_id)) {
+            witness_inst_id = LookupFinalImplWitnessForSpecificInterface(
+                context, loc_id, context.constant_values().Get(base_id),
+                assoc_interface);
+          }
+        }
+
+        if (!witness_inst_id.has_value()) {
+          // First look for `assoc_interface` in the type of the base. If it is
+          // found, get the witness that the interface is implemented from
+          // `base_id`.
+          auto identified_id = RequireIdentifiedFacetType(context, *facet_type);
+          const auto& identified =
+              context.identified_facet_types().Get(identified_id);
+          for (auto [index, base_interface] :
+               llvm::enumerate(identified.required_interfaces())) {
+            // Get the witness that `T` implements `base_type_id`.
+            if (base_interface == assoc_interface) {
+              witness_inst_id = GetOrAddInst(
+                  context, loc_id,
+                  SemIR::FacetAccessWitness{
+                      .type_id = GetSingletonType(
+                          context, SemIR::WitnessType::SingletonInstId),
+                      .facet_value_inst_id = base_id,
+                      .index = SemIR::ElementIndex(index)});
+              break;
+            }
           }
         }
         // TODO: If that fails, would need to do impl lookup to see if the facet

toolchain/check/testdata/impl/lookup/min_prelude/find_in_final.carbon

@@ -2,7 +2,7 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
-// INCLUDE-FILE: toolchain/testing/min_prelude/convert.carbon
+// INCLUDE-FILE: toolchain/testing/min_prelude/facet_types.carbon
 // EXTRA-ARGS: --no-dump-sem-ir --custom-core
 //
 // AUTOUPDATE
@@ -11,7 +11,7 @@
 // TIP: To dump output, run:
 // TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/min_prelude/find_in_final.carbon
 
-// --- fail_todo_keep_looking_for_final_impl.carbon
+// --- final_impl_precedence_over_facet.carbon
 library "[[@TEST_NAME]]";
 interface I {
   let T:! type;
@@ -20,18 +20,171 @@ interface I {
 final impl forall [U:! type] U as I where .T = () {}
 
 fn F(V:! I) -> V.T {
-  // TODO: Even though we have a witness that `V impls I` from the constraint
-  // on `I`, we should do an impl lookup to see if any effectively final impl
-  // applies when we find an unknown value in that witness. In this case, that
-  // lookup would find an impl with more specific values for associated
-  // constants that we should merge.
-
-  // CHECK:STDERR: fail_todo_keep_looking_for_final_impl.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `()` to `V.(I.T)` [ConversionFailure]
-  // CHECK:STDERR:   return ();
-  // CHECK:STDERR:   ^~~~~~~~~~
-  // CHECK:STDERR: fail_todo_keep_looking_for_final_impl.carbon:[[@LINE+4]]:3: note: type `()` does not implement interface `Core.ImplicitAs(V.(I.T))` [MissingImplInMemberAccessNote]
-  // CHECK:STDERR:   return ();
-  // CHECK:STDERR:   ^~~~~~~~~~
-  // CHECK:STDERR:
+  // Even though we have a witness that `V impls I` from the constraint on `I`,
+  // we should do an impl lookup to see if any effectively final impl applies
+  // when we find an unknown value in that witness. In this case, that lookup
+  // would find an impl with more specific values for associated constants that
+  // we should merge.
   return ();
 }
+
+// --- final_impl_precedence_over_facet_with_where.carbon
+library "[[@TEST_NAME]]";
+
+interface Z {
+  let X:! type;
+  let Y:! type;
+}
+
+final impl forall [T:! type] T as Z where .X = () and .Y = () {}
+
+fn F(ZZ:! Z where .X = ()) {
+  // Z.Y is unspecified on `ZZ` so it's found on the final impl where it's known
+  // to be the concrete type (), which can then be used in this generic
+  // function.
+  let a: ZZ.Y = ();
+}
+
+// --- final_impl_precedence_over_facet_access_type_with_where.carbon
+library "[[@TEST_NAME]]";
+
+interface Z {
+  let X:! type;
+  let Y:! type;
+}
+
+final impl forall [T:! type] T as Z where .X = () and .Y = () {}
+
+fn F[T:! Z where .X = ()](z: T) {
+  // z.Y is unspecified on `ZZ` so it's found on the final impl where it's known
+  // to be the concrete type (), which can then be used in this generic
+  // function.
+  let a: z.Y = ();
+}
+
+// --- fail_todo_final_impl_makes_compatible_facet_values.carbon
+library "[[@TEST_NAME]]";
+
+interface I {}
+interface J {}
+
+final impl forall [T:! J] T as I {}
+
+class C(T:! I) {}
+
+class D(T:! J) {
+  // Finds the final impl decl; The facet value of `T` in `C(T)` holds an
+  // `ImplWitness`.
+  var c: C(T)*;
+}
+
+fn F(T:! I & J) {
+  // `I` found in the facet type; The facet value of `T` in `C(T)` holds a `FacetAccessWitness`.
+  // TODO: It should use the `final impl` and thus hold the same `ImplWitness`
+  var x: C(T);
+  // `D.c` used the final impl decl to make a facet value with an `ImplWitness`
+  // for its `T` in `C(T)`.
+  var y: D(T);
+  // This converts a pointer to a facet value (should be `ImplWitness` but
+  // isn't) to a pointer to a facet value (with `ImplWitness`).
+  //
+  // TODO: It should type check when they are both the same generic type
+  // `C(T:! I)` defined by the `final impl` of `I`.
+  //
+  // CHECK:STDERR: fail_todo_final_impl_makes_compatible_facet_values.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `C(T as I)*` to `C(T as I)*` [ConversionFailure]
+  // CHECK:STDERR:   y.c = &x;
+  // CHECK:STDERR:   ^~~~~~~~
+  // CHECK:STDERR: fail_todo_final_impl_makes_compatible_facet_values.carbon:[[@LINE+4]]:3: note: type `C(T as I)*` does not implement interface `Core.ImplicitAs(C(T as I)*)` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   y.c = &x;
+  // CHECK:STDERR:   ^~~~~~~~
+  // CHECK:STDERR:
+  y.c = &x;
+}
+
+// --- fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon
+library "[[@TEST_NAME]]";
+
+interface I { let X:! type; }
+interface J {}
+
+impl forall [T:! J] T as I where .X = () {}
+
+class C(T:! I) {
+  var b: T.X;
+}
+
+class D(T:! J) {
+  // Finds the impl decl; The facet value of `T` in `C(T)` holds a
+  // `LookupImplWitness`.
+  var c: C(T)*;
+}
+
+fn F(T:! I & J) -> T.(I.X) {
+  // `I` found in the facet type; The facet value of `T` in `C(T)` holds a
+  // `FacetAccessWitness`.
+  var x: C(T);
+  // `D.c` used the final impl decl to make a facet value with a
+  // `LookupImplWitness` for its `T` in `C(T)`.
+  var y: D(T);
+  // This converts a pointer to a facet value (with `FacetAccessWitness`) to a
+  // pointer to a facet value (with `LookupImplWitness`).
+  //
+  // TODO: It should type check as a `LookupImplWitness` will find the same
+  // witness that `FacetAccessWitness` is accessing from the caller.
+  //
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `C(T as I)*` to `C(T as I)*` [ConversionFailure]
+  // CHECK:STDERR:   y.c = &x;
+  // CHECK:STDERR:   ^~~~~~~~
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+4]]:3: note: type `C(T as I)*` does not implement interface `Core.ImplicitAs(C(T as I)*)` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   y.c = &x;
+  // CHECK:STDERR:   ^~~~~~~~
+  // CHECK:STDERR:
+  y.c = &x;
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `(T as J as I).(I.X)` to `T.(TODO: element 0 in <witness for T, interface 0>)` [ConversionFailure]
+  // CHECK:STDERR:   return (*y.c).b;
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+4]]:3: note: type `(T as J as I).(I.X)` does not implement interface `Core.ImplicitAs(T.(TODO: element 0 in <witness for T, interface 0>))` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   return (*y.c).b;
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  return (*y.c).b;
+}
+
+class E1 {}
+impl E1 as J {}
+
+fn G1() {
+  // Doesn't see the `final impl` below. `E1.(I.X)` is `()`.
+  let a1: () = F(E1);
+}
+
+final impl forall [T:! J] T as I where .X = {} {}
+
+class E2 {}
+impl E2 as J {}
+
+fn G2() {
+  // TODO: Does see the `final impl` above. `E2.(I.X)` is `{}`.
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+7]]:16: error: cannot implicitly convert expression of type `()` to `{}` [ConversionFailure]
+  // CHECK:STDERR:   let a2: {} = F(E2);
+  // CHECK:STDERR:                ^~~~~
+  // CHECK:STDERR: fail_todo_convert_facet_value_of_facet_access_witness_to_facet_value_of_lookup_impl_witness.carbon:[[@LINE+4]]:16: note: type `()` does not implement interface `Core.ImplicitAs({})` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   let a2: {} = F(E2);
+  // CHECK:STDERR:                ^~~~~
+  // CHECK:STDERR:
+  let a2: {} = F(E2);
+}
+
+// --- todo_fail_facet_value_rewrite_incompatible_with_final_impl.carbon
+library "[[@TEST_NAME]]";
+
+interface Z {
+  let X:! type;
+}
+
+final impl forall [T:! type] T as Z where .X = () {}
+
+// TODO: This should be diagnosed as there is a final impl defining `.X = ()`,
+// which makes the LHS of this rewrite constraint concrete. And since the RHS is
+// not the same (or convertible from), the rewrite is impossible.
+fn F(ZZ:! Z where .X = {.r: ()}) {}

toolchain/check/testdata/impl/lookup/min_prelude/specialization.carbon

@@ -237,6 +237,7 @@ fn F[D:! Y](d: D) {
   // The FacetValue deduced for the param of `C` will be a symbolic FacetValue
   // because we are in a generic where `D` is an unknown type, which will cause
   // the query and impl self type to be C(FacetValue) for a symbolic FacetValue.
+  //
   // CHECK:STDERR: fail_specialized_class_with_symbolic_facet_value_param.carbon:[[@LINE+7]]:23: error: cannot implicitly convert expression of type `()` to `(C(D) as Z).(Z.X)` [ConversionFailure]
   // CHECK:STDERR:   let a: C(D).(Z.X) = ();
   // CHECK:STDERR:                       ^~
@@ -426,41 +427,7 @@ fn F() {
   let x: {} = G(C);
 }
 
-// --- fail_todo_specialization_of_type_constant_in_generic_context_with_final_impl.carbon
-library "[[@TEST_NAME]]";
-
-interface I {
-  let T:! type;
-  fn F[self: Self]() -> T;
-}
-
-impl forall [U:! type] U as I where .T = () {
-  fn F[self: Self]() -> () { return (); }
-}
-final impl forall [V:! type] V* as I where .T = V {
-  fn F[self: Self]() -> V { return *self; }
-}
-
-fn H[W:! type](v: W) -> W.(I.T) {
-  return v.(I.F)();
-}
-
-// The return of `H` is `(X*).(I.T)` which has a final impl making it `X`.
-// While this function is still a generic context, it should see the concrete
-// `X` type and the return of `H(p)` should convert (a no-op) to `X`.
-fn G[X:! type](p: X*) -> X {
-  // CHECK:STDERR: fail_todo_specialization_of_type_constant_in_generic_context_with_final_impl.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `(X* as I).(I.T)` to `X` [ConversionFailure]
-  // CHECK:STDERR:   return H(p);
-  // CHECK:STDERR:   ^~~~~~~~~~~~
-  // CHECK:STDERR: fail_todo_specialization_of_type_constant_in_generic_context_with_final_impl.carbon:[[@LINE+4]]:3: note: type `(X* as I).(I.T)` does not implement interface `Core.ImplicitAs(X)` [MissingImplInMemberAccessNote]
-  // CHECK:STDERR:   return H(p);
-  // CHECK:STDERR:   ^~~~~~~~~~~~
-  // CHECK:STDERR:
-  return H(p);
-}
-
 // --- type_structure_first_difference.carbon
-
 library "[[@TEST_NAME]]";
 
 interface Z(T:! type) {

toolchain/check/testdata/impl/lookup/min_prelude/specialization_with_symbolic_rewrite.carbon

@@ -0,0 +1,1905 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// INCLUDE-FILE: toolchain/testing/min_prelude/facet_types.carbon
+// EXTRA-ARGS: --custom-core
+//
+// AUTOUPDATE
+// TIP: To test this file alone, run:
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/lookup/min_prelude/specialization_with_symbolic_rewrite.carbon
+// TIP: To dump output, run:
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/min_prelude/specialization_with_symbolic_rewrite.carbon
+
+// --- final_specialized_symbolic_rewrite.carbon
+library "[[@TEST_NAME]]";
+
+interface Z(T:! type) {
+  let X:! type;
+}
+
+class C {}
+
+impl forall [T:! type, S:! type] T as Z(S) where .X = () {}
+
+final impl forall [T:! type] T as Z(C) where .X = T {}
+
+fn F(T:! Z(C), t: T) {
+  // This should typecheck, the `final impl` should give the same `T`.
+  let a: T.X = t;
+}
+
+// --- fail_nonfinal_specialized_symbolic_rewrite.carbon
+library "[[@TEST_NAME]]";
+
+interface Z(T:! type) {
+  let X:! type;
+}
+interface Y {}
+
+class C {}
+
+impl forall [T:! type, S:! type] T as Z(S) where .X = () {}
+
+impl forall [T:! type] T as Z(C) where .X = T {}
+
+fn F(T:! Z(C), t: T) {
+  // CHECK:STDERR: fail_nonfinal_specialized_symbolic_rewrite.carbon:[[@LINE+7]]:16: error: cannot implicitly convert expression of type `T` to `T.(Z(C).X)` [ConversionFailure]
+  // CHECK:STDERR:   let a: T.X = t;
+  // CHECK:STDERR:                ^
+  // CHECK:STDERR: fail_nonfinal_specialized_symbolic_rewrite.carbon:[[@LINE+4]]:16: note: type `T` does not implement interface `Core.ImplicitAs(T.(Z(C).X))` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   let a: T.X = t;
+  // CHECK:STDERR:                ^
+  // CHECK:STDERR:
+  let a: T.X = t;
+}
+
+// --- final_impl_rewrite_of_symbolic_through_impl_witness.carbon
+library "[[@TEST_NAME]]";
+
+interface Ptr {
+  let Type:! type;
+}
+
+final impl forall [U:! type] U as Ptr where .Type = U* {}
+
+fn F[T:! type](var t: T) -> T.(Ptr.Type) {
+  return &t;
+}
+
+// --- final_impl_rewrite_of_symbolic_through_facet_access_type.carbon
+library "[[@TEST_NAME]]";
+
+interface Ptr {
+  let Type:! type;
+}
+
+final impl forall [U:! type] U as Ptr where .Type = U* {}
+
+fn F[T:! Ptr](var t: T) -> T.Type {
+  return &t;
+}
+
+// --- fail_todo_final_impl_rewrite_of_symbolic_through_facet_access_witness.carbon
+library "[[@TEST_NAME]]";
+
+interface Ptr {
+  let Type:! type;
+}
+
+final impl forall [U:! type] U as Ptr where .Type = U* {}
+
+fn F[T:! Ptr](var t: T) -> T.(Ptr.Type) {
+  // CHECK:STDERR: fail_todo_final_impl_rewrite_of_symbolic_through_facet_access_witness.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `T*` to `T.(Ptr.Type)` [ConversionFailure]
+  // CHECK:STDERR:   return &t;
+  // CHECK:STDERR:   ^~~~~~~~~~
+  // CHECK:STDERR: fail_todo_final_impl_rewrite_of_symbolic_through_facet_access_witness.carbon:[[@LINE+4]]:3: note: type `T*` does not implement interface `Core.ImplicitAs(T.(Ptr.Type))` [MissingImplInMemberAccessNote]
+  // CHECK:STDERR:   return &t;
+  // CHECK:STDERR:   ^~~~~~~~~~
+  // CHECK:STDERR:
+  return &t;
+}
+
+// CHECK:STDOUT: --- final_specialized_symbolic_rewrite.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %T.8b3: type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.e01: type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %Z.type.9fb: type = generic_interface_type @Z [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %Z.generic: %Z.type.9fb = struct_value () [concrete]
+// CHECK:STDOUT:   %Z.type.a61: type = facet_type <@Z, @Z(%T.8b3)> [symbolic]
+// CHECK:STDOUT:   %Self.2bc: %Z.type.a61 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.26e: type = assoc_entity_type @Z, @Z(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %assoc0.1cd: %Z.assoc_type.26e = assoc_entity element0, @Z.%X [symbolic]
+// CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %S: type = bind_symbolic_name S, 1 [symbolic]
+// CHECK:STDOUT:   %S.patt: type = symbolic_binding_pattern S, 1 [symbolic]
+// CHECK:STDOUT:   %Z.type.8e9: type = facet_type <@Z, @Z(%S)> [symbolic]
+// CHECK:STDOUT:   %.Self.eb1: %Z.type.8e9 = bind_symbolic_name .Self [symbolic]
+// CHECK:STDOUT:   %Self.831: %Z.type.8e9 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.0e7: type = assoc_entity_type @Z, @Z(%S) [symbolic]
+// CHECK:STDOUT:   %assoc0.abb: %Z.assoc_type.0e7 = assoc_entity element0, @Z.%X [symbolic]
+// CHECK:STDOUT:   %require_complete.b87: <witness> = require_complete_type %Z.type.8e9 [symbolic]
+// CHECK:STDOUT:   %.Self.as_type.ffd: type = facet_access_type %.Self.eb1 [symbolic]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.178: <witness> = facet_access_witness %.Self.eb1, element0 [symbolic]
+// CHECK:STDOUT:   %Z.facet.868: %Z.type.8e9 = facet_value %.Self.as_type.ffd, (%.Self.as_wit.iface0.178) [symbolic]
+// CHECK:STDOUT:   %impl.elem0.a53: type = impl_witness_access %.Self.as_wit.iface0.178, element0 [symbolic]
+// CHECK:STDOUT:   %Z_where.type.93a: type = facet_type <@Z, @Z(%S) where %impl.elem0.a53 = %empty_tuple.type> [symbolic]
+// CHECK:STDOUT:   %require_complete.619: <witness> = require_complete_type %Z_where.type.93a [symbolic]
+// CHECK:STDOUT:   %impl_witness.dba: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc9), @impl.76d(%T.8b3, %S) [symbolic]
+// CHECK:STDOUT:   %Z.type.049: type = facet_type <@Z, @Z(%C)> [concrete]
+// CHECK:STDOUT:   %.Self.3c5: %Z.type.049 = bind_symbolic_name .Self [symbolic_self]
+// CHECK:STDOUT:   %Self.a38: %Z.type.049 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.252: type = assoc_entity_type @Z, @Z(%C) [concrete]
+// CHECK:STDOUT:   %assoc0.ea4: %Z.assoc_type.252 = assoc_entity element0, @Z.%X [concrete]
+// CHECK:STDOUT:   %.Self.as_type.c3c: type = facet_access_type %.Self.3c5 [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.72c: <witness> = facet_access_witness %.Self.3c5, element0 [symbolic_self]
+// CHECK:STDOUT:   %Z.facet.375: %Z.type.049 = facet_value %.Self.as_type.c3c, (%.Self.as_wit.iface0.72c) [symbolic_self]
+// CHECK:STDOUT:   %impl.elem0.802: type = impl_witness_access %.Self.as_wit.iface0.72c, element0 [symbolic_self]
+// CHECK:STDOUT:   %Z_where.type.bee: type = facet_type <@Z, @Z(%C) where %impl.elem0.802 = %T.8b3> [symbolic]
+// CHECK:STDOUT:   %require_complete.13f: <witness> = require_complete_type %Z_where.type.bee [symbolic]
+// CHECK:STDOUT:   %impl_witness.a9c: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc11), @impl.44b(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %T.62d: %Z.type.049 = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.897: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %T.as_type: type = facet_access_type %T.62d [symbolic]
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %require_complete.2b1: <witness> = require_complete_type %T.as_type [symbolic]
+// CHECK:STDOUT:   %Z_where.type.c29: type = facet_type <@Z, @Z(%C) where %impl.elem0.802 = %T.as_type> [symbolic]
+// CHECK:STDOUT:   %require_complete.c8a: <witness> = require_complete_type %Z_where.type.c29 [symbolic]
+// CHECK:STDOUT:   %impl_witness.7ef: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc11), @impl.44b(%T.as_type) [symbolic]
+// CHECK:STDOUT:   %Z.facet.ffe: %Z.type.049 = facet_value %T.as_type, (%impl_witness.7ef) [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Z = %Z.decl
+// CHECK:STDOUT:     .C = %C.decl
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Z.decl: %Z.type.9fb = interface_decl @Z [concrete = constants.%Z.generic] {
+// CHECK:STDOUT:     %T.patt.loc3_13.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc3_13.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.loc3_13.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc3_13.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
+// CHECK:STDOUT:   impl_decl @impl.76d [concrete] {
+// CHECK:STDOUT:     %T.patt.loc9_14.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:     %S.patt.loc9_24.1: type = symbolic_binding_pattern S, 1 [symbolic = %S.patt.loc9_24.2 (constants.%S.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref: type = name_ref T, %T.loc9_14.1 [symbolic = %T.loc9_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:     %S.ref: type = name_ref S, %S.loc9_24.1 [symbolic = %S.loc9_24.2 (constants.%S)]
+// CHECK:STDOUT:     %Z.type.loc9_42.1: type = facet_type <@Z, @Z(constants.%S)> [symbolic = %Z.type.loc9_42.2 (constants.%Z.type.8e9)]
+// CHECK:STDOUT:     %.Self.1: @impl.76d.%Z.type.loc9_42.2 (%Z.type.8e9) = bind_symbolic_name .Self [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:     %.Self.ref: @impl.76d.%Z.type.loc9_42.2 (%Z.type.8e9) = name_ref .Self, %.Self.1 [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:     %.loc9_50.1: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = specific_constant @X.%assoc0, @Z(constants.%S) [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:     %X.ref: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = name_ref X, %.loc9_50.1 [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:     %.Self.as_type.loc9_50.1: type = facet_access_type %.Self.ref [symbolic = %.Self.as_type.loc9_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:     %.loc9_50.2: type = converted %.Self.ref, %.Self.as_type.loc9_50.1 [symbolic = %.Self.as_type.loc9_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:     %.Self.as_wit.iface0.loc9_50.1: <witness> = facet_access_witness %.Self.ref, element0 [symbolic = %.Self.as_wit.iface0.loc9_50.2 (constants.%.Self.as_wit.iface0.178)]
+// CHECK:STDOUT:     %impl.elem0.loc9_50.1: type = impl_witness_access %.Self.as_wit.iface0.loc9_50.1, element0 [symbolic = %impl.elem0.loc9_50.2 (constants.%impl.elem0.a53)]
+// CHECK:STDOUT:     %.loc9_56.1: %empty_tuple.type = tuple_literal ()
+// CHECK:STDOUT:     %.loc9_56.2: type = converted %.loc9_56.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
+// CHECK:STDOUT:     %.loc9_44: type = where_expr %.Self.1 [symbolic = %Z_where.type (constants.%Z_where.type.93a)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0.loc9_50.1, %.loc9_56.2
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc9_14.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc9_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %S.loc9_24.1: type = bind_symbolic_name S, 1 [symbolic = %S.loc9_24.2 (constants.%S)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness.loc9: <witness> = impl_witness (%impl_witness_assoc_constant.loc9), @impl.76d(constants.%T.8b3, constants.%S) [symbolic = @impl.76d.%impl_witness (constants.%impl_witness.dba)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant.loc9: type = impl_witness_assoc_constant constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
+// CHECK:STDOUT:   impl_decl @impl.44b [concrete] {
+// CHECK:STDOUT:     %T.patt.loc11_20.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc11_20.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref.loc11_30: type = name_ref T, %T.loc11_20.1 [symbolic = %T.loc11_20.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:     %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:     %Z.type: type = facet_type <@Z, @Z(constants.%C)> [concrete = constants.%Z.type.049]
+// CHECK:STDOUT:     %.Self: %Z.type.049 = bind_symbolic_name .Self [symbolic_self = constants.%.Self.3c5]
+// CHECK:STDOUT:     %.Self.ref: %Z.type.049 = name_ref .Self, %.Self [symbolic_self = constants.%.Self.3c5]
+// CHECK:STDOUT:     %.loc11_46.1: %Z.assoc_type.252 = specific_constant @X.%assoc0, @Z(constants.%C) [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:     %X.ref: %Z.assoc_type.252 = name_ref X, %.loc11_46.1 [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.as_type.c3c]
+// CHECK:STDOUT:     %.loc11_46.2: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.as_type.c3c]
+// CHECK:STDOUT:     %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self.ref, element0 [symbolic_self = constants.%.Self.as_wit.iface0.72c]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self = constants.%impl.elem0.802]
+// CHECK:STDOUT:     %T.ref.loc11_51: type = name_ref T, %T.loc11_20.1 [symbolic = %T.loc11_20.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %.loc11_40: type = where_expr %.Self [symbolic = %Z_where.type (constants.%Z_where.type.bee)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %T.ref.loc11_51
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc11_20.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc11_20.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness.loc11: <witness> = impl_witness (%impl_witness_assoc_constant.loc11), @impl.44b(constants.%T.8b3) [symbolic = @impl.44b.%impl_witness (constants.%impl_witness.a9c)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant.loc11: type = impl_witness_assoc_constant constants.%T.8b3 [symbolic = @impl.44b.%T.loc11_20.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
+// CHECK:STDOUT:     %T.patt.loc13_6.1: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_6.2 (constants.%T.patt.897)]
+// CHECK:STDOUT:     %t.patt: @F.%T.as_type.loc13_19.2 (%T.as_type) = binding_pattern t
+// CHECK:STDOUT:     %t.param_patt: @F.%T.as_type.loc13_19.2 (%T.as_type) = value_param_pattern %t.patt, call_param0
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %.loc13_13: type = splice_block %Z.type [concrete = constants.%Z.type.049] {
+// CHECK:STDOUT:       %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:       %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:       %Z.type: type = facet_type <@Z, @Z(constants.%C)> [concrete = constants.%Z.type.049]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc13_6.1: %Z.type.049 = bind_symbolic_name T, 0 [symbolic = %T.loc13_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:     %t.param: @F.%T.as_type.loc13_19.2 (%T.as_type) = value_param call_param0
+// CHECK:STDOUT:     %.loc13_19.1: type = splice_block %.loc13_19.2 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)] {
+// CHECK:STDOUT:       %T.ref.loc13: %Z.type.049 = name_ref T, %T.loc13_6.1 [symbolic = %T.loc13_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:       %T.as_type.loc13_19.1: type = facet_access_type %T.ref.loc13 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc13_19.2: type = converted %T.ref.loc13, %T.as_type.loc13_19.1 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t: @F.%T.as_type.loc13_19.2 (%T.as_type) = bind_name t, %t.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @Z(%T.loc3_13.1: type) {
+// CHECK:STDOUT:   %T.loc3_13.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc3_13.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc3_13.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc3_13.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type: type = facet_type <@Z, @Z(%T.loc3_13.2)> [symbolic = %Z.type (constants.%Z.type.a61)]
+// CHECK:STDOUT:   %Self.2: @Z.%Z.type (%Z.type.a61) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.2bc)]
+// CHECK:STDOUT:   %Z.assoc_type: type = assoc_entity_type @Z, @Z(%T.loc3_13.2) [symbolic = %Z.assoc_type (constants.%Z.assoc_type.26e)]
+// CHECK:STDOUT:   %assoc0: @Z.%Z.assoc_type (%Z.assoc_type.26e) = assoc_entity element0, %X [symbolic = %assoc0 (constants.%assoc0.1cd)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @Z.%Z.type (%Z.type.a61) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.2bc)]
+// CHECK:STDOUT:     %X: type = assoc_const_decl @X [concrete] {
+// CHECK:STDOUT:       %assoc0: @Z.%Z.assoc_type (%Z.assoc_type.26e) = assoc_entity element0, @Z.%X [symbolic = @Z.%assoc0 (constants.%assoc0.1cd)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .X = @X.%assoc0
+// CHECK:STDOUT:     witness = (%X)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic assoc_const @X(@Z.%T.loc3_13.1: type, @Z.%Self.1: @Z.%Z.type (%Z.type.a61)) {
+// CHECK:STDOUT:   assoc_const X:! type;
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.76d(%T.loc9_14.1: type, %S.loc9_24.1: type) {
+// CHECK:STDOUT:   %T.loc9_14.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc9_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc9_14.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %S.loc9_24.2: type = bind_symbolic_name S, 1 [symbolic = %S.loc9_24.2 (constants.%S)]
+// CHECK:STDOUT:   %S.patt.loc9_24.2: type = symbolic_binding_pattern S, 1 [symbolic = %S.patt.loc9_24.2 (constants.%S.patt)]
+// CHECK:STDOUT:   %Z.type.loc9_42.2: type = facet_type <@Z, @Z(%S.loc9_24.2)> [symbolic = %Z.type.loc9_42.2 (constants.%Z.type.8e9)]
+// CHECK:STDOUT:   %.Self.2: @impl.76d.%Z.type.loc9_42.2 (%Z.type.8e9) = bind_symbolic_name .Self [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:   %require_complete.loc9_50: <witness> = require_complete_type @impl.76d.%Z.type.loc9_42.2 (%Z.type.8e9) [symbolic = %require_complete.loc9_50 (constants.%require_complete.b87)]
+// CHECK:STDOUT:   %Z.assoc_type: type = assoc_entity_type @Z, @Z(%S.loc9_24.2) [symbolic = %Z.assoc_type (constants.%Z.assoc_type.0e7)]
+// CHECK:STDOUT:   %assoc0: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = assoc_entity element0, @Z.%X [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:   %.Self.as_type.loc9_50.2: type = facet_access_type %.Self.2 [symbolic = %.Self.as_type.loc9_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.loc9_50.2: <witness> = facet_access_witness %.Self.2, element0 [symbolic = %.Self.as_wit.iface0.loc9_50.2 (constants.%.Self.as_wit.iface0.178)]
+// CHECK:STDOUT:   %impl.elem0.loc9_50.2: type = impl_witness_access %.Self.as_wit.iface0.loc9_50.2, element0 [symbolic = %impl.elem0.loc9_50.2 (constants.%impl.elem0.a53)]
+// CHECK:STDOUT:   %Z_where.type: type = facet_type <@Z, @Z(%S.loc9_24.2) where %impl.elem0.loc9_50.2 = constants.%empty_tuple.type> [symbolic = %Z_where.type (constants.%Z_where.type.93a)]
+// CHECK:STDOUT:   %require_complete.loc9_44: <witness> = require_complete_type @impl.76d.%Z_where.type (%Z_where.type.93a) [symbolic = %require_complete.loc9_44 (constants.%require_complete.619)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc9), @impl.76d(%T.loc9_14.2, %S.loc9_24.2) [symbolic = %impl_witness (constants.%impl_witness.dba)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %T.ref as %.loc9_44 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness.loc9
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.44b(%T.loc11_20.1: type) {
+// CHECK:STDOUT:   %T.loc11_20.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc11_20.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc11_20.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc11_20.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %Z_where.type: type = facet_type <@Z, @Z(constants.%C) where constants.%impl.elem0.802 = %T.loc11_20.2> [symbolic = %Z_where.type (constants.%Z_where.type.bee)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.44b.%Z_where.type (%Z_where.type.bee) [symbolic = %require_complete (constants.%require_complete.13f)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc11), @impl.44b(%T.loc11_20.2) [symbolic = %impl_witness (constants.%impl_witness.a9c)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %T.ref.loc11_30 as %.loc11_40 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness.loc11
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @C {
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
+// CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @F(%T.loc13_6.1: %Z.type.049) {
+// CHECK:STDOUT:   %T.loc13_6.2: %Z.type.049 = bind_symbolic_name T, 0 [symbolic = %T.loc13_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:   %T.patt.loc13_6.2: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_6.2 (constants.%T.patt.897)]
+// CHECK:STDOUT:   %T.as_type.loc13_19.2: type = facet_access_type %T.loc13_6.2 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @F.%T.as_type.loc13_19.2 (%T.as_type) [symbolic = %require_complete (constants.%require_complete.2b1)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%T.patt.loc13_6.1: %Z.type.049, %t.param_patt: @F.%T.as_type.loc13_19.2 (%T.as_type)) {
+// CHECK:STDOUT:   !entry:
+// CHECK:STDOUT:     name_binding_decl {
+// CHECK:STDOUT:       %a.patt: @F.%T.as_type.loc13_19.2 (%T.as_type) = binding_pattern a
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t.ref: @F.%T.as_type.loc13_19.2 (%T.as_type) = name_ref t, %t
+// CHECK:STDOUT:     %.loc15_11.1: type = splice_block %impl.elem0 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)] {
+// CHECK:STDOUT:       %T.ref.loc15: %Z.type.049 = name_ref T, %T.loc13_6.1 [symbolic = %T.loc13_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:       %.loc15_11.2: %Z.assoc_type.252 = specific_constant @X.%assoc0, @Z(constants.%C) [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:       %X.ref: %Z.assoc_type.252 = name_ref X, %.loc15_11.2 [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:       %T.as_type.loc15_11.1: type = facet_access_type %T.ref.loc15 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc15_11.3: type = converted %T.ref.loc15, %T.as_type.loc15_11.1 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %T.as_type.loc15_11.2: type = facet_access_type constants.%T.62d [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc15_11.4: type = converted constants.%T.62d, %T.as_type.loc15_11.2 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %impl.elem0: type = impl_witness_access constants.%impl_witness.7ef, element0 [symbolic = %T.as_type.loc13_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %a: @F.%T.as_type.loc13_19.2 (%T.as_type) = bind_name a, %t.ref
+// CHECK:STDOUT:     return
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%T.8b3) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%T.8b3, constants.%Self.2bc) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(%T.loc3_13.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%S) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%S
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type => constants.%Z.type.8e9
+// CHECK:STDOUT:   %Self.2 => constants.%Self.831
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.0e7
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.abb
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%S, constants.%Z.facet.868) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.76d(constants.%T.8b3, constants.%S) {
+// CHECK:STDOUT:   %T.loc9_14.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc9_14.2 => constants.%T.patt.e01
+// CHECK:STDOUT:   %S.loc9_24.2 => constants.%S
+// CHECK:STDOUT:   %S.patt.loc9_24.2 => constants.%S.patt
+// CHECK:STDOUT:   %Z.type.loc9_42.2 => constants.%Z.type.8e9
+// CHECK:STDOUT:   %.Self.2 => constants.%.Self.eb1
+// CHECK:STDOUT:   %require_complete.loc9_50 => constants.%require_complete.b87
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.0e7
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.abb
+// CHECK:STDOUT:   %.Self.as_type.loc9_50.2 => constants.%.Self.as_type.ffd
+// CHECK:STDOUT:   %.Self.as_wit.iface0.loc9_50.2 => constants.%.Self.as_wit.iface0.178
+// CHECK:STDOUT:   %impl.elem0.loc9_50.2 => constants.%impl.elem0.a53
+// CHECK:STDOUT:   %Z_where.type => constants.%Z_where.type.93a
+// CHECK:STDOUT:   %require_complete.loc9_44 => constants.%require_complete.619
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.dba
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(@impl.76d.%S.loc9_24.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.76d(%T.loc9_14.2, %S.loc9_24.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%C) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%C
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type => constants.%Z.type.049
+// CHECK:STDOUT:   %Self.2 => constants.%Self.a38
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.252
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.ea4
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%C, constants.%Z.facet.375) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.44b(constants.%T.8b3) {
+// CHECK:STDOUT:   %T.loc11_20.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc11_20.2 => constants.%T.patt.e01
+// CHECK:STDOUT:   %Z_where.type => constants.%Z_where.type.bee
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.13f
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.a9c
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.44b(%T.loc11_20.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @F(constants.%T.62d) {
+// CHECK:STDOUT:   %T.loc13_6.2 => constants.%T.62d
+// CHECK:STDOUT:   %T.patt.loc13_6.2 => constants.%T.patt.897
+// CHECK:STDOUT:   %T.as_type.loc13_19.2 => constants.%T.as_type
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.44b(constants.%T.as_type) {
+// CHECK:STDOUT:   %T.loc11_20.2 => constants.%T.as_type
+// CHECK:STDOUT:   %T.patt.loc11_20.2 => constants.%T.patt.e01
+// CHECK:STDOUT:   %Z_where.type => constants.%Z_where.type.c29
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.c8a
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.7ef
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%C, constants.%Z.facet.ffe) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_nonfinal_specialized_symbolic_rewrite.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %T.8b3: type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.e01: type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %Z.type.9fb: type = generic_interface_type @Z [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %Z.generic: %Z.type.9fb = struct_value () [concrete]
+// CHECK:STDOUT:   %Z.type.a61: type = facet_type <@Z, @Z(%T.8b3)> [symbolic]
+// CHECK:STDOUT:   %Self.2bc: %Z.type.a61 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.26e: type = assoc_entity_type @Z, @Z(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %assoc0.1cd: %Z.assoc_type.26e = assoc_entity element0, @Z.%X [symbolic]
+// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
+// CHECK:STDOUT:   %Self.b29: %Y.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %S: type = bind_symbolic_name S, 1 [symbolic]
+// CHECK:STDOUT:   %S.patt: type = symbolic_binding_pattern S, 1 [symbolic]
+// CHECK:STDOUT:   %Z.type.8e9: type = facet_type <@Z, @Z(%S)> [symbolic]
+// CHECK:STDOUT:   %.Self.eb1: %Z.type.8e9 = bind_symbolic_name .Self [symbolic]
+// CHECK:STDOUT:   %Self.831: %Z.type.8e9 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.0e7: type = assoc_entity_type @Z, @Z(%S) [symbolic]
+// CHECK:STDOUT:   %assoc0.abb: %Z.assoc_type.0e7 = assoc_entity element0, @Z.%X [symbolic]
+// CHECK:STDOUT:   %require_complete.b87: <witness> = require_complete_type %Z.type.8e9 [symbolic]
+// CHECK:STDOUT:   %.Self.as_type.ffd: type = facet_access_type %.Self.eb1 [symbolic]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.178: <witness> = facet_access_witness %.Self.eb1, element0 [symbolic]
+// CHECK:STDOUT:   %Z.facet.868: %Z.type.8e9 = facet_value %.Self.as_type.ffd, (%.Self.as_wit.iface0.178) [symbolic]
+// CHECK:STDOUT:   %impl.elem0.a53: type = impl_witness_access %.Self.as_wit.iface0.178, element0 [symbolic]
+// CHECK:STDOUT:   %Z_where.type.93a: type = facet_type <@Z, @Z(%S) where %impl.elem0.a53 = %empty_tuple.type> [symbolic]
+// CHECK:STDOUT:   %require_complete.619: <witness> = require_complete_type %Z_where.type.93a [symbolic]
+// CHECK:STDOUT:   %impl_witness.dba: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc10), @impl.76d(%T.8b3, %S) [symbolic]
+// CHECK:STDOUT:   %Z.type.049: type = facet_type <@Z, @Z(%C)> [concrete]
+// CHECK:STDOUT:   %.Self.3c5: %Z.type.049 = bind_symbolic_name .Self [symbolic_self]
+// CHECK:STDOUT:   %Self.a38: %Z.type.049 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Z.assoc_type.252: type = assoc_entity_type @Z, @Z(%C) [concrete]
+// CHECK:STDOUT:   %assoc0.ea4: %Z.assoc_type.252 = assoc_entity element0, @Z.%X [concrete]
+// CHECK:STDOUT:   %.Self.as_type.c3c: type = facet_access_type %.Self.3c5 [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.72c: <witness> = facet_access_witness %.Self.3c5, element0 [symbolic_self]
+// CHECK:STDOUT:   %Z.facet.375: %Z.type.049 = facet_value %.Self.as_type.c3c, (%.Self.as_wit.iface0.72c) [symbolic_self]
+// CHECK:STDOUT:   %impl.elem0.802: type = impl_witness_access %.Self.as_wit.iface0.72c, element0 [symbolic_self]
+// CHECK:STDOUT:   %Z_where.type.bee: type = facet_type <@Z, @Z(%C) where %impl.elem0.802 = %T.8b3> [symbolic]
+// CHECK:STDOUT:   %require_complete.13f: <witness> = require_complete_type %Z_where.type.bee [symbolic]
+// CHECK:STDOUT:   %impl_witness.a9c: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc12), @impl.44b(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %T.62d: %Z.type.049 = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.897: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %T.as_type: type = facet_access_type %T.62d [symbolic]
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %require_complete.2b1: <witness> = require_complete_type %T.as_type [symbolic]
+// CHECK:STDOUT:   %T.as_wit.iface0: <witness> = facet_access_witness %T.62d, element0 [symbolic]
+// CHECK:STDOUT:   %Z.facet.c2f: %Z.type.049 = facet_value %T.as_type, (%T.as_wit.iface0) [symbolic]
+// CHECK:STDOUT:   %impl.elem0.44a: type = impl_witness_access %T.as_wit.iface0, element0 [symbolic]
+// CHECK:STDOUT:   %require_complete.b00: <witness> = require_complete_type %impl.elem0.44a [symbolic]
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.d62: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.519: %ImplicitAs.type.d62 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Dest.patt: type = symbolic_binding_pattern Dest, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.275: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.42e: %Convert.type.275 = struct_value () [symbolic]
+// CHECK:STDOUT:   %Self.as_type: type = facet_access_type %Self.519 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type.ca0: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.9f5: %ImplicitAs.assoc_type.ca0 = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.fb2: type = facet_type <@ImplicitAs, @ImplicitAs(%impl.elem0.44a)> [symbolic]
+// CHECK:STDOUT:   %Self.643: %ImplicitAs.type.fb2 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Convert.type.6ea: type = fn_type @Convert, @ImplicitAs(%impl.elem0.44a) [symbolic]
+// CHECK:STDOUT:   %Convert.d0b: %Convert.type.6ea = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type.40d: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%impl.elem0.44a) [symbolic]
+// CHECK:STDOUT:   %assoc0.763: %ImplicitAs.assoc_type.40d = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic]
+// CHECK:STDOUT:   %require_complete.462: <witness> = require_complete_type %ImplicitAs.type.fb2 [symbolic]
+// CHECK:STDOUT:   %assoc0.dc0: %ImplicitAs.assoc_type.ca0 = assoc_entity element0, imports.%Core.import_ref.207 [symbolic]
+// CHECK:STDOUT:   %BitAnd.type: type = facet_type <@BitAnd> [concrete]
+// CHECK:STDOUT:   %impl_witness.b81: <witness> = impl_witness (imports.%Core.import_ref.bd4), @impl.f92(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %Op.type: type = fn_type @Op, @impl.f92(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %Op: %Op.type = struct_value () [symbolic]
+// CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T.8b3 [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.1: type = import_ref Core//prelude, loc13_22, loaded [symbolic = @ImplicitAs.%Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Core.import_ref.ff5 = import_ref Core//prelude, inst67 [no loc], unloaded
+// CHECK:STDOUT:   %Core.import_ref.492: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type.ca0) = import_ref Core//prelude, loc14_35, loaded [symbolic = @ImplicitAs.%assoc0 (constants.%assoc0.dc0)]
+// CHECK:STDOUT:   %Core.Convert = import_ref Core//prelude, Convert, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.2: type = import_ref Core//prelude, loc13_22, loaded [symbolic = @ImplicitAs.%Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Core.import_ref.ce1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62) = import_ref Core//prelude, inst67 [no loc], loaded [symbolic = @ImplicitAs.%Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Core.import_ref.1c7: @ImplicitAs.%Convert.type (%Convert.type.275) = import_ref Core//prelude, loc14_35, loaded [symbolic = @ImplicitAs.%Convert (constants.%Convert.42e)]
+// CHECK:STDOUT:   %Core.import_ref.ad0 = import_ref Core//prelude, inst102 [no loc], unloaded
+// CHECK:STDOUT:   %Core.import_ref.02e = import_ref Core//prelude, loc18_41, unloaded
+// CHECK:STDOUT:   %Core.Op = import_ref Core//prelude, Op, unloaded
+// CHECK:STDOUT:   %Core.import_ref.f80 = import_ref Core//prelude, loc21_36, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.3: type = import_ref Core//prelude, loc21_14, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT:   %Core.import_ref.583: type = import_ref Core//prelude, loc21_24, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT:   %Core.import_ref.9c1: type = import_ref Core//prelude, loc21_29, loaded [concrete = constants.%BitAnd.type]
+// CHECK:STDOUT:   %Core.import_ref.bd4 = import_ref Core//prelude, loc22_42, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.4: type = import_ref Core//prelude, loc21_14, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Z = %Z.decl
+// CHECK:STDOUT:     .Y = %Y.decl
+// CHECK:STDOUT:     .C = %C.decl
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Z.decl: %Z.type.9fb = interface_decl @Z [concrete = constants.%Z.generic] {
+// CHECK:STDOUT:     %T.patt.loc3_13.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc3_13.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.loc3_13.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc3_13.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Y.decl: type = interface_decl @Y [concrete = constants.%Y.type] {} {}
+// CHECK:STDOUT:   %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
+// CHECK:STDOUT:   impl_decl @impl.76d [concrete] {
+// CHECK:STDOUT:     %T.patt.loc10_14.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc10_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:     %S.patt.loc10_24.1: type = symbolic_binding_pattern S, 1 [symbolic = %S.patt.loc10_24.2 (constants.%S.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref: type = name_ref T, %T.loc10_14.1 [symbolic = %T.loc10_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:     %S.ref: type = name_ref S, %S.loc10_24.1 [symbolic = %S.loc10_24.2 (constants.%S)]
+// CHECK:STDOUT:     %Z.type.loc10_42.1: type = facet_type <@Z, @Z(constants.%S)> [symbolic = %Z.type.loc10_42.2 (constants.%Z.type.8e9)]
+// CHECK:STDOUT:     %.Self.1: @impl.76d.%Z.type.loc10_42.2 (%Z.type.8e9) = bind_symbolic_name .Self [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:     %.Self.ref: @impl.76d.%Z.type.loc10_42.2 (%Z.type.8e9) = name_ref .Self, %.Self.1 [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:     %.loc10_50.1: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = specific_constant @X.%assoc0, @Z(constants.%S) [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:     %X.ref: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = name_ref X, %.loc10_50.1 [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:     %.Self.as_type.loc10_50.1: type = facet_access_type %.Self.ref [symbolic = %.Self.as_type.loc10_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:     %.loc10_50.2: type = converted %.Self.ref, %.Self.as_type.loc10_50.1 [symbolic = %.Self.as_type.loc10_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:     %.Self.as_wit.iface0.loc10_50.1: <witness> = facet_access_witness %.Self.ref, element0 [symbolic = %.Self.as_wit.iface0.loc10_50.2 (constants.%.Self.as_wit.iface0.178)]
+// CHECK:STDOUT:     %impl.elem0.loc10_50.1: type = impl_witness_access %.Self.as_wit.iface0.loc10_50.1, element0 [symbolic = %impl.elem0.loc10_50.2 (constants.%impl.elem0.a53)]
+// CHECK:STDOUT:     %.loc10_56.1: %empty_tuple.type = tuple_literal ()
+// CHECK:STDOUT:     %.loc10_56.2: type = converted %.loc10_56.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
+// CHECK:STDOUT:     %.loc10_44: type = where_expr %.Self.1 [symbolic = %Z_where.type (constants.%Z_where.type.93a)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0.loc10_50.1, %.loc10_56.2
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc10_14.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc10_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %S.loc10_24.1: type = bind_symbolic_name S, 1 [symbolic = %S.loc10_24.2 (constants.%S)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness.loc10: <witness> = impl_witness (%impl_witness_assoc_constant.loc10), @impl.76d(constants.%T.8b3, constants.%S) [symbolic = @impl.76d.%impl_witness (constants.%impl_witness.dba)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant.loc10: type = impl_witness_assoc_constant constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
+// CHECK:STDOUT:   impl_decl @impl.44b [concrete] {
+// CHECK:STDOUT:     %T.patt.loc12_14.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc12_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref.loc12_24: type = name_ref T, %T.loc12_14.1 [symbolic = %T.loc12_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:     %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:     %Z.type: type = facet_type <@Z, @Z(constants.%C)> [concrete = constants.%Z.type.049]
+// CHECK:STDOUT:     %.Self: %Z.type.049 = bind_symbolic_name .Self [symbolic_self = constants.%.Self.3c5]
+// CHECK:STDOUT:     %.Self.ref: %Z.type.049 = name_ref .Self, %.Self [symbolic_self = constants.%.Self.3c5]
+// CHECK:STDOUT:     %.loc12_40.1: %Z.assoc_type.252 = specific_constant @X.%assoc0, @Z(constants.%C) [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:     %X.ref: %Z.assoc_type.252 = name_ref X, %.loc12_40.1 [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.as_type.c3c]
+// CHECK:STDOUT:     %.loc12_40.2: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.as_type.c3c]
+// CHECK:STDOUT:     %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self.ref, element0 [symbolic_self = constants.%.Self.as_wit.iface0.72c]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self = constants.%impl.elem0.802]
+// CHECK:STDOUT:     %T.ref.loc12_45: type = name_ref T, %T.loc12_14.1 [symbolic = %T.loc12_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:     %.loc12_34: type = where_expr %.Self [symbolic = %Z_where.type (constants.%Z_where.type.bee)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %T.ref.loc12_45
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc12_14.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc12_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness.loc12: <witness> = impl_witness (%impl_witness_assoc_constant.loc12), @impl.44b(constants.%T.8b3) [symbolic = @impl.44b.%impl_witness (constants.%impl_witness.a9c)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant.loc12: type = impl_witness_assoc_constant constants.%T.8b3 [symbolic = @impl.44b.%T.loc12_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
+// CHECK:STDOUT:     %T.patt.loc14_6.1: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc14_6.2 (constants.%T.patt.897)]
+// CHECK:STDOUT:     %t.patt: @F.%T.as_type.loc14_19.2 (%T.as_type) = binding_pattern t
+// CHECK:STDOUT:     %t.param_patt: @F.%T.as_type.loc14_19.2 (%T.as_type) = value_param_pattern %t.patt, call_param0
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %.loc14_13: type = splice_block %Z.type [concrete = constants.%Z.type.049] {
+// CHECK:STDOUT:       %Z.ref: %Z.type.9fb = name_ref Z, file.%Z.decl [concrete = constants.%Z.generic]
+// CHECK:STDOUT:       %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:       %Z.type: type = facet_type <@Z, @Z(constants.%C)> [concrete = constants.%Z.type.049]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %T.loc14_6.1: %Z.type.049 = bind_symbolic_name T, 0 [symbolic = %T.loc14_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:     %t.param: @F.%T.as_type.loc14_19.2 (%T.as_type) = value_param call_param0
+// CHECK:STDOUT:     %.loc14_19.1: type = splice_block %.loc14_19.2 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)] {
+// CHECK:STDOUT:       %T.ref.loc14: %Z.type.049 = name_ref T, %T.loc14_6.1 [symbolic = %T.loc14_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:       %T.as_type.loc14_19.1: type = facet_access_type %T.ref.loc14 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc14_19.2: type = converted %T.ref.loc14, %T.as_type.loc14_19.1 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t: @F.%T.as_type.loc14_19.2 (%T.as_type) = bind_name t, %t.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @Z(%T.loc3_13.1: type) {
+// CHECK:STDOUT:   %T.loc3_13.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc3_13.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc3_13.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc3_13.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type: type = facet_type <@Z, @Z(%T.loc3_13.2)> [symbolic = %Z.type (constants.%Z.type.a61)]
+// CHECK:STDOUT:   %Self.2: @Z.%Z.type (%Z.type.a61) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.2bc)]
+// CHECK:STDOUT:   %Z.assoc_type: type = assoc_entity_type @Z, @Z(%T.loc3_13.2) [symbolic = %Z.assoc_type (constants.%Z.assoc_type.26e)]
+// CHECK:STDOUT:   %assoc0: @Z.%Z.assoc_type (%Z.assoc_type.26e) = assoc_entity element0, %X [symbolic = %assoc0 (constants.%assoc0.1cd)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @Z.%Z.type (%Z.type.a61) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.2bc)]
+// CHECK:STDOUT:     %X: type = assoc_const_decl @X [concrete] {
+// CHECK:STDOUT:       %assoc0: @Z.%Z.assoc_type (%Z.assoc_type.26e) = assoc_entity element0, @Z.%X [symbolic = @Z.%assoc0 (constants.%assoc0.1cd)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .X = @X.%assoc0
+// CHECK:STDOUT:     witness = (%X)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @Y {
+// CHECK:STDOUT:   %Self: %Y.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.b29]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = %Self
+// CHECK:STDOUT:   witness = ()
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @ImplicitAs(imports.%Core.import_ref.5ab3ec.1: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Dest.patt: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt (constants.%Dest.patt)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.d62)]
+// CHECK:STDOUT:   %Self: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic = %Convert.type (constants.%Convert.type.275)]
+// CHECK:STDOUT:   %Convert: @ImplicitAs.%Convert.type (%Convert.type.275) = struct_value () [symbolic = %Convert (constants.%Convert.42e)]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic = %ImplicitAs.assoc_type (constants.%ImplicitAs.assoc_type.ca0)]
+// CHECK:STDOUT:   %assoc0: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type.ca0) = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic = %assoc0 (constants.%assoc0.9f5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%Core.import_ref.ff5
+// CHECK:STDOUT:     .Convert = imports.%Core.import_ref.492
+// CHECK:STDOUT:     witness = (imports.%Core.Convert)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @BitAnd [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%Core.import_ref.ad0
+// CHECK:STDOUT:   .Op = imports.%Core.import_ref.02e
+// CHECK:STDOUT:   witness = (imports.%Core.Op)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic assoc_const @X(@Z.%T.loc3_13.1: type, @Z.%Self.1: @Z.%Z.type (%Z.type.a61)) {
+// CHECK:STDOUT:   assoc_const X:! type;
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.76d(%T.loc10_14.1: type, %S.loc10_24.1: type) {
+// CHECK:STDOUT:   %T.loc10_14.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc10_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc10_14.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc10_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %S.loc10_24.2: type = bind_symbolic_name S, 1 [symbolic = %S.loc10_24.2 (constants.%S)]
+// CHECK:STDOUT:   %S.patt.loc10_24.2: type = symbolic_binding_pattern S, 1 [symbolic = %S.patt.loc10_24.2 (constants.%S.patt)]
+// CHECK:STDOUT:   %Z.type.loc10_42.2: type = facet_type <@Z, @Z(%S.loc10_24.2)> [symbolic = %Z.type.loc10_42.2 (constants.%Z.type.8e9)]
+// CHECK:STDOUT:   %.Self.2: @impl.76d.%Z.type.loc10_42.2 (%Z.type.8e9) = bind_symbolic_name .Self [symbolic = %.Self.2 (constants.%.Self.eb1)]
+// CHECK:STDOUT:   %require_complete.loc10_50: <witness> = require_complete_type @impl.76d.%Z.type.loc10_42.2 (%Z.type.8e9) [symbolic = %require_complete.loc10_50 (constants.%require_complete.b87)]
+// CHECK:STDOUT:   %Z.assoc_type: type = assoc_entity_type @Z, @Z(%S.loc10_24.2) [symbolic = %Z.assoc_type (constants.%Z.assoc_type.0e7)]
+// CHECK:STDOUT:   %assoc0: @impl.76d.%Z.assoc_type (%Z.assoc_type.0e7) = assoc_entity element0, @Z.%X [symbolic = %assoc0 (constants.%assoc0.abb)]
+// CHECK:STDOUT:   %.Self.as_type.loc10_50.2: type = facet_access_type %.Self.2 [symbolic = %.Self.as_type.loc10_50.2 (constants.%.Self.as_type.ffd)]
+// CHECK:STDOUT:   %.Self.as_wit.iface0.loc10_50.2: <witness> = facet_access_witness %.Self.2, element0 [symbolic = %.Self.as_wit.iface0.loc10_50.2 (constants.%.Self.as_wit.iface0.178)]
+// CHECK:STDOUT:   %impl.elem0.loc10_50.2: type = impl_witness_access %.Self.as_wit.iface0.loc10_50.2, element0 [symbolic = %impl.elem0.loc10_50.2 (constants.%impl.elem0.a53)]
+// CHECK:STDOUT:   %Z_where.type: type = facet_type <@Z, @Z(%S.loc10_24.2) where %impl.elem0.loc10_50.2 = constants.%empty_tuple.type> [symbolic = %Z_where.type (constants.%Z_where.type.93a)]
+// CHECK:STDOUT:   %require_complete.loc10_44: <witness> = require_complete_type @impl.76d.%Z_where.type (%Z_where.type.93a) [symbolic = %require_complete.loc10_44 (constants.%require_complete.619)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc10), @impl.76d(%T.loc10_14.2, %S.loc10_24.2) [symbolic = %impl_witness (constants.%impl_witness.dba)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %T.ref as %.loc10_44 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness.loc10
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.44b(%T.loc12_14.1: type) {
+// CHECK:STDOUT:   %T.loc12_14.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc12_14.2 (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt.loc12_14.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc12_14.2 (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %Z_where.type: type = facet_type <@Z, @Z(constants.%C) where constants.%impl.elem0.802 = %T.loc12_14.2> [symbolic = %Z_where.type (constants.%Z_where.type.bee)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.44b.%Z_where.type (%Z_where.type.bee) [symbolic = %require_complete (constants.%require_complete.13f)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant.loc12), @impl.44b(%T.loc12_14.2) [symbolic = %impl_witness (constants.%impl_witness.a9c)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %T.ref.loc12_24 as %.loc12_34 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness.loc12
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.f92(imports.%Core.import_ref.5ab3ec.3: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (imports.%Core.import_ref.bd4), @impl.f92(%T) [symbolic = %impl_witness (constants.%impl_witness.b81)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Op.type: type = fn_type @Op, @impl.f92(%T) [symbolic = %Op.type (constants.%Op.type)]
+// CHECK:STDOUT:   %Op: @impl.f92.%Op.type (%Op.type) = struct_value () [symbolic = %Op (constants.%Op)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.f92.%T (%T.8b3) [symbolic = %require_complete (constants.%require_complete.4ae)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: imports.%Core.import_ref.583 as imports.%Core.import_ref.9c1 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = imports.%Core.import_ref.f80
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @C {
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
+// CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @F(%T.loc14_6.1: %Z.type.049) {
+// CHECK:STDOUT:   %T.loc14_6.2: %Z.type.049 = bind_symbolic_name T, 0 [symbolic = %T.loc14_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:   %T.patt.loc14_6.2: %Z.type.049 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc14_6.2 (constants.%T.patt.897)]
+// CHECK:STDOUT:   %T.as_type.loc14_19.2: type = facet_access_type %T.loc14_6.2 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %require_complete.loc14: <witness> = require_complete_type @F.%T.as_type.loc14_19.2 (%T.as_type) [symbolic = %require_complete.loc14 (constants.%require_complete.2b1)]
+// CHECK:STDOUT:   %T.as_wit.iface0.loc22_11.2: <witness> = facet_access_witness %T.loc14_6.2, element0 [symbolic = %T.as_wit.iface0.loc22_11.2 (constants.%T.as_wit.iface0)]
+// CHECK:STDOUT:   %impl.elem0.loc22_11.2: type = impl_witness_access %T.as_wit.iface0.loc22_11.2, element0 [symbolic = %impl.elem0.loc22_11.2 (constants.%impl.elem0.44a)]
+// CHECK:STDOUT:   %require_complete.loc22_11: <witness> = require_complete_type @F.%impl.elem0.loc22_11.2 (%impl.elem0.44a) [symbolic = %require_complete.loc22_11 (constants.%require_complete.b00)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%impl.elem0.loc22_11.2)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.fb2)]
+// CHECK:STDOUT:   %require_complete.loc22_16: <witness> = require_complete_type @F.%ImplicitAs.type (%ImplicitAs.type.fb2) [symbolic = %require_complete.loc22_16 (constants.%require_complete.462)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%T.patt.loc14_6.1: %Z.type.049, %t.param_patt: @F.%T.as_type.loc14_19.2 (%T.as_type)) {
+// CHECK:STDOUT:   !entry:
+// CHECK:STDOUT:     name_binding_decl {
+// CHECK:STDOUT:       %a.patt: @F.%impl.elem0.loc22_11.2 (%impl.elem0.44a) = binding_pattern a
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t.ref: @F.%T.as_type.loc14_19.2 (%T.as_type) = name_ref t, %t
+// CHECK:STDOUT:     %.loc22_11.1: type = splice_block %impl.elem0.loc22_11.1 [symbolic = %impl.elem0.loc22_11.2 (constants.%impl.elem0.44a)] {
+// CHECK:STDOUT:       %T.ref.loc22: %Z.type.049 = name_ref T, %T.loc14_6.1 [symbolic = %T.loc14_6.2 (constants.%T.62d)]
+// CHECK:STDOUT:       %.loc22_11.2: %Z.assoc_type.252 = specific_constant @X.%assoc0, @Z(constants.%C) [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:       %X.ref: %Z.assoc_type.252 = name_ref X, %.loc22_11.2 [concrete = constants.%assoc0.ea4]
+// CHECK:STDOUT:       %T.as_type.loc22: type = facet_access_type %T.ref.loc22 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc22_11.3: type = converted %T.ref.loc22, %T.as_type.loc22 [symbolic = %T.as_type.loc14_19.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %T.as_wit.iface0.loc22_11.1: <witness> = facet_access_witness %T.ref.loc22, element0 [symbolic = %T.as_wit.iface0.loc22_11.2 (constants.%T.as_wit.iface0)]
+// CHECK:STDOUT:       %impl.elem0.loc22_11.1: type = impl_witness_access %T.as_wit.iface0.loc22_11.1, element0 [symbolic = %impl.elem0.loc22_11.2 (constants.%impl.elem0.44a)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %.loc22_16: @F.%impl.elem0.loc22_11.2 (%impl.elem0.44a) = converted %t.ref, <error> [concrete = <error>]
+// CHECK:STDOUT:     %a: @F.%impl.elem0.loc22_11.2 (%impl.elem0.44a) = bind_name a, <error>
+// CHECK:STDOUT:     return
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert(imports.%Core.import_ref.5ab3ec.2: type, imports.%Core.import_ref.ce1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62)) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.d62)]
+// CHECK:STDOUT:   %Self: @Convert.%ImplicitAs.type (%ImplicitAs.type.d62) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Self.as_type: type = facet_access_type %Self [symbolic = %Self.as_type (constants.%Self.as_type)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Convert.%Self.as_type (%Self.as_type)]() -> @Convert.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Op(imports.%Core.import_ref.5ab3ec.4: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T.8b3)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Op.%T (%T.8b3)](%other.param_patt: @Op.%T (%T.8b3)) -> @Op.%T (%T.8b3) = "type.and";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%T.8b3) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%T.8b3, constants.%Self.2bc) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(%T.loc3_13.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%S) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%S
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type => constants.%Z.type.8e9
+// CHECK:STDOUT:   %Self.2 => constants.%Self.831
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.0e7
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.abb
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%S, constants.%Z.facet.868) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.76d(constants.%T.8b3, constants.%S) {
+// CHECK:STDOUT:   %T.loc10_14.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc10_14.2 => constants.%T.patt.e01
+// CHECK:STDOUT:   %S.loc10_24.2 => constants.%S
+// CHECK:STDOUT:   %S.patt.loc10_24.2 => constants.%S.patt
+// CHECK:STDOUT:   %Z.type.loc10_42.2 => constants.%Z.type.8e9
+// CHECK:STDOUT:   %.Self.2 => constants.%.Self.eb1
+// CHECK:STDOUT:   %require_complete.loc10_50 => constants.%require_complete.b87
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.0e7
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.abb
+// CHECK:STDOUT:   %.Self.as_type.loc10_50.2 => constants.%.Self.as_type.ffd
+// CHECK:STDOUT:   %.Self.as_wit.iface0.loc10_50.2 => constants.%.Self.as_wit.iface0.178
+// CHECK:STDOUT:   %impl.elem0.loc10_50.2 => constants.%impl.elem0.a53
+// CHECK:STDOUT:   %Z_where.type => constants.%Z_where.type.93a
+// CHECK:STDOUT:   %require_complete.loc10_44 => constants.%require_complete.619
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.dba
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(@impl.76d.%S.loc10_24.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.76d(%T.loc10_14.2, %S.loc10_24.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Z(constants.%C) {
+// CHECK:STDOUT:   %T.loc3_13.2 => constants.%C
+// CHECK:STDOUT:   %T.patt.loc3_13.2 => constants.%T.patt.e01
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Z.type => constants.%Z.type.049
+// CHECK:STDOUT:   %Self.2 => constants.%Self.a38
+// CHECK:STDOUT:   %Z.assoc_type => constants.%Z.assoc_type.252
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.ea4
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%C, constants.%Z.facet.375) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.44b(constants.%T.8b3) {
+// CHECK:STDOUT:   %T.loc12_14.2 => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt.loc12_14.2 => constants.%T.patt.e01
+// CHECK:STDOUT:   %Z_where.type => constants.%Z_where.type.bee
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.13f
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.a9c
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.44b(%T.loc12_14.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @F(constants.%T.62d) {
+// CHECK:STDOUT:   %T.loc14_6.2 => constants.%T.62d
+// CHECK:STDOUT:   %T.patt.loc14_6.2 => constants.%T.patt.897
+// CHECK:STDOUT:   %T.as_type.loc14_19.2 => constants.%T.as_type
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @X(constants.%C, constants.%Z.facet.c2f) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%Dest) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %Dest.patt => constants.%Dest.patt
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(@Convert.%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert(constants.%Dest, constants.%Self.519) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.d62
+// CHECK:STDOUT:   %Self => constants.%Self.519
+// CHECK:STDOUT:   %Self.as_type => constants.%Self.as_type
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%impl.elem0.44a) {
+// CHECK:STDOUT:   %Dest => constants.%impl.elem0.44a
+// CHECK:STDOUT:   %Dest.patt => constants.%Dest.patt
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.fb2
+// CHECK:STDOUT:   %Self => constants.%Self.643
+// CHECK:STDOUT:   %Convert.type => constants.%Convert.type.6ea
+// CHECK:STDOUT:   %Convert => constants.%Convert.d0b
+// CHECK:STDOUT:   %ImplicitAs.assoc_type => constants.%ImplicitAs.assoc_type.40d
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.763
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.f92(constants.%T.8b3) {
+// CHECK:STDOUT:   %T => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt => constants.%T.patt.e01
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.b81
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.f92(%T) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Op(constants.%T.8b3) {
+// CHECK:STDOUT:   %T => constants.%T.8b3
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(@F.%impl.elem0.loc22_11.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- final_impl_rewrite_of_symbolic_through_impl_witness.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Ptr.type: type = facet_type <@Ptr> [concrete]
+// CHECK:STDOUT:   %Self: %Ptr.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %Ptr.assoc_type: type = assoc_entity_type @Ptr [concrete]
+// CHECK:STDOUT:   %assoc0: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete]
+// CHECK:STDOUT:   %U: type = bind_symbolic_name U, 0 [symbolic]
+// CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 0 [symbolic]
+// CHECK:STDOUT:   %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_type: type = facet_access_type %.Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self, element0 [symbolic_self]
+// CHECK:STDOUT:   %Ptr.facet.879: %Ptr.type = facet_value %.Self.as_type, (%.Self.as_wit.iface0) [symbolic_self]
+// CHECK:STDOUT:   %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self]
+// CHECK:STDOUT:   %ptr.79f131.1: type = ptr_type %U [symbolic]
+// CHECK:STDOUT:   %Ptr_where.type.d906c9.1: type = facet_type <@Ptr where %impl.elem0 = %ptr.79f131.1> [symbolic]
+// CHECK:STDOUT:   %require_complete.0dd5ec.1: <witness> = require_complete_type %Ptr_where.type.d906c9.1 [symbolic]
+// CHECK:STDOUT:   %impl_witness.4de5dc.1: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%U) [symbolic]
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %ptr.79f131.2: type = ptr_type %T [symbolic]
+// CHECK:STDOUT:   %Ptr_where.type.d906c9.2: type = facet_type <@Ptr where %impl.elem0 = %ptr.79f131.2> [symbolic]
+// CHECK:STDOUT:   %require_complete.0dd5ec.2: <witness> = require_complete_type %Ptr_where.type.d906c9.2 [symbolic]
+// CHECK:STDOUT:   %impl_witness.4de5dc.2: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%T) [symbolic]
+// CHECK:STDOUT:   %Ptr.facet.55b: %Ptr.type = facet_value %T, (%impl_witness.4de5dc.2) [symbolic]
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %require_complete.6e5: <witness> = require_complete_type %ptr.79f131.2 [symbolic]
+// CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Ptr = %Ptr.decl
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Ptr.decl: type = interface_decl @Ptr [concrete = constants.%Ptr.type] {} {}
+// CHECK:STDOUT:   impl_decl @impl [concrete] {
+// CHECK:STDOUT:     %U.patt.loc7_20.1: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %U.ref.loc7_30: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %Ptr.ref: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %.Self.ref: %Ptr.type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0]
+// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.loc7_45: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self.ref, element0 [symbolic_self = constants.%.Self.as_wit.iface0]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self = constants.%impl.elem0]
+// CHECK:STDOUT:     %U.ref.loc7_53: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %ptr.loc7_54.1: type = ptr_type %U.ref.loc7_53 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f131.1)]
+// CHECK:STDOUT:     %.loc7_39: type = where_expr %.Self [symbolic = %Ptr_where.type (constants.%Ptr_where.type.d906c9.1)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %ptr.loc7_54.1
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %U.loc7_20.1: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (%impl_witness_assoc_constant), @impl(constants.%U) [symbolic = @impl.%impl_witness (constants.%impl_witness.4de5dc.1)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant: type = impl_witness_assoc_constant constants.%ptr.79f131.1 [symbolic = @impl.%ptr.loc7_54.2 (constants.%ptr.79f131.1)]
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
+// CHECK:STDOUT:     %T.patt.loc9_6.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt)]
+// CHECK:STDOUT:     %t.patt: @F.%T.loc9_6.2 (%T) = binding_pattern t
+// CHECK:STDOUT:     %t.param_patt: @F.%T.loc9_6.2 (%T) = ref_param_pattern %t.patt, call_param0
+// CHECK:STDOUT:     %.loc9_16: @F.%T.loc9_6.2 (%T) = var_pattern %t.param_patt
+// CHECK:STDOUT:     %return.patt: @F.%ptr (%ptr.79f131.2) = return_slot_pattern
+// CHECK:STDOUT:     %return.param_patt: @F.%ptr (%ptr.79f131.2) = out_param_pattern %return.patt, call_param1
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref.loc9_29: type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:     %Ptr.ref: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0]
+// CHECK:STDOUT:     %Ptr.facet.loc9_30.1: %Ptr.type = facet_value constants.%T, (constants.%impl_witness.4de5dc.2) [symbolic = %Ptr.facet.loc9_30.2 (constants.%Ptr.facet.55b)]
+// CHECK:STDOUT:     %.loc9_30: %Ptr.type = converted %T.ref.loc9_29, %Ptr.facet.loc9_30.1 [symbolic = %Ptr.facet.loc9_30.2 (constants.%Ptr.facet.55b)]
+// CHECK:STDOUT:     %as_wit.iface0: <witness> = facet_access_witness %.loc9_30, element0 [symbolic = %impl_witness (constants.%impl_witness.4de5dc.2)]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %as_wit.iface0, element0 [symbolic = %ptr (constants.%ptr.79f131.2)]
+// CHECK:STDOUT:     %T.loc9_6.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:     %t.param: ref @F.%T.loc9_6.2 (%T) = ref_param call_param0
+// CHECK:STDOUT:     %T.ref.loc9_23: type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:     %t: ref @F.%T.loc9_6.2 (%T) = bind_name t, %t.param
+// CHECK:STDOUT:     %return.param: ref @F.%ptr (%ptr.79f131.2) = out_param call_param1
+// CHECK:STDOUT:     %return: ref @F.%ptr (%ptr.79f131.2) = return_slot %return.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @Ptr {
+// CHECK:STDOUT:   %Self: %Ptr.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
+// CHECK:STDOUT:   %Type: type = assoc_const_decl @Type [concrete] {
+// CHECK:STDOUT:     %assoc0: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete = constants.%assoc0]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = %Self
+// CHECK:STDOUT:   .Type = @Type.%assoc0
+// CHECK:STDOUT:   witness = (%Type)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic assoc_const @Type(@Ptr.%Self: %Ptr.type) {
+// CHECK:STDOUT:   assoc_const Type:! type;
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl(%U.loc7_20.1: type) {
+// CHECK:STDOUT:   %U.loc7_20.2: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   %U.patt.loc7_20.2: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   %ptr.loc7_54.2: type = ptr_type %U.loc7_20.2 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f131.1)]
+// CHECK:STDOUT:   %Ptr_where.type: type = facet_type <@Ptr where constants.%impl.elem0 = %ptr.loc7_54.2> [symbolic = %Ptr_where.type (constants.%Ptr_where.type.d906c9.1)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.%Ptr_where.type (%Ptr_where.type.d906c9.1) [symbolic = %require_complete (constants.%require_complete.0dd5ec.1)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%U.loc7_20.2) [symbolic = %impl_witness (constants.%impl_witness.4de5dc.1)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %U.ref.loc7_30 as %.loc7_39 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @F(%T.loc9_6.1: type) {
+// CHECK:STDOUT:   %T.loc9_6.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:   %T.patt.loc9_6.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%T.loc9_6.2) [symbolic = %impl_witness (constants.%impl_witness.4de5dc.2)]
+// CHECK:STDOUT:   %Ptr.facet.loc9_30.2: %Ptr.type = facet_value %T.loc9_6.2, (%impl_witness) [symbolic = %Ptr.facet.loc9_30.2 (constants.%Ptr.facet.55b)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %T.loc9_6.2 [symbolic = %ptr (constants.%ptr.79f131.2)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %require_complete.loc9_26: <witness> = require_complete_type @F.%ptr (%ptr.79f131.2) [symbolic = %require_complete.loc9_26 (constants.%require_complete.6e5)]
+// CHECK:STDOUT:   %require_complete.loc9_16: <witness> = require_complete_type @F.%T.loc9_6.2 (%T) [symbolic = %require_complete.loc9_16 (constants.%require_complete.4ae)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%T.patt.loc9_6.1: type](%.loc9_16: @F.%T.loc9_6.2 (%T)) -> @F.%ptr (%ptr.79f131.2) {
+// CHECK:STDOUT:   !entry:
+// CHECK:STDOUT:     %t.ref: ref @F.%T.loc9_6.2 (%T) = name_ref t, %t
+// CHECK:STDOUT:     %addr: @F.%ptr (%ptr.79f131.2) = addr_of %t.ref
+// CHECK:STDOUT:     return %addr
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Self) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.879) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(constants.%U) {
+// CHECK:STDOUT:   %U.loc7_20.2 => constants.%U
+// CHECK:STDOUT:   %U.patt.loc7_20.2 => constants.%U.patt
+// CHECK:STDOUT:   %ptr.loc7_54.2 => constants.%ptr.79f131.1
+// CHECK:STDOUT:   %Ptr_where.type => constants.%Ptr_where.type.d906c9.1
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.0dd5ec.1
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.4de5dc.1
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(%U.loc7_20.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(constants.%T) {
+// CHECK:STDOUT:   %U.loc7_20.2 => constants.%T
+// CHECK:STDOUT:   %U.patt.loc7_20.2 => constants.%U.patt
+// CHECK:STDOUT:   %ptr.loc7_54.2 => constants.%ptr.79f131.2
+// CHECK:STDOUT:   %Ptr_where.type => constants.%Ptr_where.type.d906c9.2
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.0dd5ec.2
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.4de5dc.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.55b) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @F(constants.%T) {
+// CHECK:STDOUT:   %T.loc9_6.2 => constants.%T
+// CHECK:STDOUT:   %T.patt.loc9_6.2 => constants.%T.patt
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.4de5dc.2
+// CHECK:STDOUT:   %Ptr.facet.loc9_30.2 => constants.%Ptr.facet.55b
+// CHECK:STDOUT:   %ptr => constants.%ptr.79f131.2
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(@F.%T.loc9_6.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- final_impl_rewrite_of_symbolic_through_facet_access_type.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Ptr.type: type = facet_type <@Ptr> [concrete]
+// CHECK:STDOUT:   %Self: %Ptr.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %Ptr.assoc_type: type = assoc_entity_type @Ptr [concrete]
+// CHECK:STDOUT:   %assoc0: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete]
+// CHECK:STDOUT:   %U: type = bind_symbolic_name U, 0 [symbolic]
+// CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 0 [symbolic]
+// CHECK:STDOUT:   %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_type: type = facet_access_type %.Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self, element0 [symbolic_self]
+// CHECK:STDOUT:   %Ptr.facet.879: %Ptr.type = facet_value %.Self.as_type, (%.Self.as_wit.iface0) [symbolic_self]
+// CHECK:STDOUT:   %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self]
+// CHECK:STDOUT:   %ptr.79f: type = ptr_type %U [symbolic]
+// CHECK:STDOUT:   %Ptr_where.type.d90: type = facet_type <@Ptr where %impl.elem0 = %ptr.79f> [symbolic]
+// CHECK:STDOUT:   %require_complete.0dd: <witness> = require_complete_type %Ptr_where.type.d90 [symbolic]
+// CHECK:STDOUT:   %impl_witness.4de: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%U) [symbolic]
+// CHECK:STDOUT:   %T: %Ptr.type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %T.as_type: type = facet_access_type %T [symbolic]
+// CHECK:STDOUT:   %ptr.900: type = ptr_type %T.as_type [symbolic]
+// CHECK:STDOUT:   %Ptr_where.type.a9b: type = facet_type <@Ptr where %impl.elem0 = %ptr.900> [symbolic]
+// CHECK:STDOUT:   %require_complete.a17: <witness> = require_complete_type %Ptr_where.type.a9b [symbolic]
+// CHECK:STDOUT:   %impl_witness.780: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%T.as_type) [symbolic]
+// CHECK:STDOUT:   %Ptr.facet.7fd: %Ptr.type = facet_value %T.as_type, (%impl_witness.780) [symbolic]
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %require_complete.df6: <witness> = require_complete_type %ptr.900 [symbolic]
+// CHECK:STDOUT:   %require_complete.020: <witness> = require_complete_type %T.as_type [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Ptr = %Ptr.decl
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Ptr.decl: type = interface_decl @Ptr [concrete = constants.%Ptr.type] {} {}
+// CHECK:STDOUT:   impl_decl @impl [concrete] {
+// CHECK:STDOUT:     %U.patt.loc7_20.1: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %U.ref.loc7_30: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %Ptr.ref: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %.Self.ref: %Ptr.type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0]
+// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.loc7_45: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self.ref, element0 [symbolic_self = constants.%.Self.as_wit.iface0]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self = constants.%impl.elem0]
+// CHECK:STDOUT:     %U.ref.loc7_53: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %ptr.loc7_54.1: type = ptr_type %U.ref.loc7_53 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:     %.loc7_39: type = where_expr %.Self [symbolic = %Ptr_where.type (constants.%Ptr_where.type.d90)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %ptr.loc7_54.1
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %U.loc7_20.1: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (%impl_witness_assoc_constant), @impl(constants.%U) [symbolic = @impl.%impl_witness (constants.%impl_witness.4de)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant: type = impl_witness_assoc_constant constants.%ptr.79f [symbolic = @impl.%ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
+// CHECK:STDOUT:     %T.patt.loc9_6.1: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt)]
+// CHECK:STDOUT:     %t.patt: @F.%T.as_type.loc9_22.2 (%T.as_type) = binding_pattern t
+// CHECK:STDOUT:     %t.param_patt: @F.%T.as_type.loc9_22.2 (%T.as_type) = ref_param_pattern %t.patt, call_param0
+// CHECK:STDOUT:     %.loc9_15: @F.%T.as_type.loc9_22.2 (%T.as_type) = var_pattern %t.param_patt
+// CHECK:STDOUT:     %return.patt: @F.%ptr (%ptr.900) = return_slot_pattern
+// CHECK:STDOUT:     %return.param_patt: @F.%ptr (%ptr.900) = out_param_pattern %return.patt, call_param1
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref.loc9_28: %Ptr.type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0]
+// CHECK:STDOUT:     %T.as_type.loc9_29.1: type = facet_access_type %T.ref.loc9_28 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     %.loc9_29.1: type = converted %T.ref.loc9_28, %T.as_type.loc9_29.1 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     %T.as_type.loc9_29.2: type = facet_access_type constants.%T [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     %.loc9_29.2: type = converted constants.%T, %T.as_type.loc9_29.2 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access constants.%impl_witness.780, element0 [symbolic = %ptr (constants.%ptr.900)]
+// CHECK:STDOUT:     %Ptr.ref: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %T.loc9_6.1: %Ptr.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:     %t.param: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = ref_param call_param0
+// CHECK:STDOUT:     %.loc9_22.1: type = splice_block %.loc9_22.2 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)] {
+// CHECK:STDOUT:       %T.ref.loc9_22: %Ptr.type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:       %T.as_type.loc9_22.1: type = facet_access_type %T.ref.loc9_22 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc9_22.2: type = converted %T.ref.loc9_22, %T.as_type.loc9_22.1 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = bind_name t, %t.param
+// CHECK:STDOUT:     %return.param: ref @F.%ptr (%ptr.900) = out_param call_param1
+// CHECK:STDOUT:     %return: ref @F.%ptr (%ptr.900) = return_slot %return.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @Ptr {
+// CHECK:STDOUT:   %Self: %Ptr.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
+// CHECK:STDOUT:   %Type: type = assoc_const_decl @Type [concrete] {
+// CHECK:STDOUT:     %assoc0: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete = constants.%assoc0]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = %Self
+// CHECK:STDOUT:   .Type = @Type.%assoc0
+// CHECK:STDOUT:   witness = (%Type)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic assoc_const @Type(@Ptr.%Self: %Ptr.type) {
+// CHECK:STDOUT:   assoc_const Type:! type;
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl(%U.loc7_20.1: type) {
+// CHECK:STDOUT:   %U.loc7_20.2: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   %U.patt.loc7_20.2: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   %ptr.loc7_54.2: type = ptr_type %U.loc7_20.2 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:   %Ptr_where.type: type = facet_type <@Ptr where constants.%impl.elem0 = %ptr.loc7_54.2> [symbolic = %Ptr_where.type (constants.%Ptr_where.type.d90)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.%Ptr_where.type (%Ptr_where.type.d90) [symbolic = %require_complete (constants.%require_complete.0dd)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl(%U.loc7_20.2) [symbolic = %impl_witness (constants.%impl_witness.4de)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %U.ref.loc7_30 as %.loc7_39 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @F(%T.loc9_6.1: %Ptr.type) {
+// CHECK:STDOUT:   %T.loc9_6.2: %Ptr.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T)]
+// CHECK:STDOUT:   %T.patt.loc9_6.2: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt)]
+// CHECK:STDOUT:   %T.as_type.loc9_22.2: type = facet_access_type %T.loc9_6.2 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %T.as_type.loc9_22.2 [symbolic = %ptr (constants.%ptr.900)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %require_complete.loc9_25: <witness> = require_complete_type @F.%ptr (%ptr.900) [symbolic = %require_complete.loc9_25 (constants.%require_complete.df6)]
+// CHECK:STDOUT:   %require_complete.loc9_15: <witness> = require_complete_type @F.%T.as_type.loc9_22.2 (%T.as_type) [symbolic = %require_complete.loc9_15 (constants.%require_complete.020)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%T.patt.loc9_6.1: %Ptr.type](%.loc9_15: @F.%T.as_type.loc9_22.2 (%T.as_type)) -> @F.%ptr (%ptr.900) {
+// CHECK:STDOUT:   !entry:
+// CHECK:STDOUT:     %t.ref: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = name_ref t, %t
+// CHECK:STDOUT:     %addr: @F.%ptr (%ptr.900) = addr_of %t.ref
+// CHECK:STDOUT:     return %addr
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Self) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.879) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(constants.%U) {
+// CHECK:STDOUT:   %U.loc7_20.2 => constants.%U
+// CHECK:STDOUT:   %U.patt.loc7_20.2 => constants.%U.patt
+// CHECK:STDOUT:   %ptr.loc7_54.2 => constants.%ptr.79f
+// CHECK:STDOUT:   %Ptr_where.type => constants.%Ptr_where.type.d90
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.0dd
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.4de
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(%U.loc7_20.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(constants.%T.as_type) {
+// CHECK:STDOUT:   %U.loc7_20.2 => constants.%T.as_type
+// CHECK:STDOUT:   %U.patt.loc7_20.2 => constants.%U.patt
+// CHECK:STDOUT:   %ptr.loc7_54.2 => constants.%ptr.900
+// CHECK:STDOUT:   %Ptr_where.type => constants.%Ptr_where.type.a9b
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.a17
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.780
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.7fd) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @F(constants.%T) {
+// CHECK:STDOUT:   %T.loc9_6.2 => constants.%T
+// CHECK:STDOUT:   %T.patt.loc9_6.2 => constants.%T.patt
+// CHECK:STDOUT:   %T.as_type.loc9_22.2 => constants.%T.as_type
+// CHECK:STDOUT:   %ptr => constants.%ptr.900
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_todo_final_impl_rewrite_of_symbolic_through_facet_access_witness.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Ptr.type: type = facet_type <@Ptr> [concrete]
+// CHECK:STDOUT:   %Self.972: %Ptr.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %Ptr.assoc_type: type = assoc_entity_type @Ptr [concrete]
+// CHECK:STDOUT:   %assoc0.d28: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete]
+// CHECK:STDOUT:   %U: type = bind_symbolic_name U, 0 [symbolic]
+// CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 0 [symbolic]
+// CHECK:STDOUT:   %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_type: type = facet_access_type %.Self [symbolic_self]
+// CHECK:STDOUT:   %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self, element0 [symbolic_self]
+// CHECK:STDOUT:   %Ptr.facet.879: %Ptr.type = facet_value %.Self.as_type, (%.Self.as_wit.iface0) [symbolic_self]
+// CHECK:STDOUT:   %impl.elem0.dff: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self]
+// CHECK:STDOUT:   %ptr.79f: type = ptr_type %U [symbolic]
+// CHECK:STDOUT:   %Ptr_where.type: type = facet_type <@Ptr where %impl.elem0.dff = %ptr.79f> [symbolic]
+// CHECK:STDOUT:   %require_complete.0dd: <witness> = require_complete_type %Ptr_where.type [symbolic]
+// CHECK:STDOUT:   %impl_witness.4de: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl.a8e(%U) [symbolic]
+// CHECK:STDOUT:   %T.972: %Ptr.type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.0a1: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %T.as_type: type = facet_access_type %T.972 [symbolic]
+// CHECK:STDOUT:   %T.as_wit.iface0: <witness> = facet_access_witness %T.972, element0 [symbolic]
+// CHECK:STDOUT:   %Ptr.facet.7ad: %Ptr.type = facet_value %T.as_type, (%T.as_wit.iface0) [symbolic]
+// CHECK:STDOUT:   %impl.elem0.9f2: type = impl_witness_access %T.as_wit.iface0, element0 [symbolic]
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %require_complete.357: <witness> = require_complete_type %impl.elem0.9f2 [symbolic]
+// CHECK:STDOUT:   %require_complete.020: <witness> = require_complete_type %T.as_type [symbolic]
+// CHECK:STDOUT:   %ptr.900: type = ptr_type %T.as_type [symbolic]
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.d62: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.519: %ImplicitAs.type.d62 = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Dest.patt: type = symbolic_binding_pattern Dest, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.275: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.42e: %Convert.type.275 = struct_value () [symbolic]
+// CHECK:STDOUT:   %Self.as_type: type = facet_access_type %Self.519 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type.ca0: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.9f5: %ImplicitAs.assoc_type.ca0 = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.73f: type = facet_type <@ImplicitAs, @ImplicitAs(%impl.elem0.9f2)> [symbolic]
+// CHECK:STDOUT:   %Self.20d: %ImplicitAs.type.73f = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Convert.type.c52: type = fn_type @Convert, @ImplicitAs(%impl.elem0.9f2) [symbolic]
+// CHECK:STDOUT:   %Convert.c34: %Convert.type.c52 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type.3d1: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%impl.elem0.9f2) [symbolic]
+// CHECK:STDOUT:   %assoc0.802: %ImplicitAs.assoc_type.3d1 = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic]
+// CHECK:STDOUT:   %require_complete.5f0: <witness> = require_complete_type %ImplicitAs.type.73f [symbolic]
+// CHECK:STDOUT:   %assoc0.dc0: %ImplicitAs.assoc_type.ca0 = assoc_entity element0, imports.%Core.import_ref.207 [symbolic]
+// CHECK:STDOUT:   %BitAnd.type: type = facet_type <@BitAnd> [concrete]
+// CHECK:STDOUT:   %T.8b3: type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt.e01: type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %impl_witness.b81: <witness> = impl_witness (imports.%Core.import_ref.bd4), @impl.f92(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %Op.type: type = fn_type @Op, @impl.f92(%T.8b3) [symbolic]
+// CHECK:STDOUT:   %Op: %Op.type = struct_value () [symbolic]
+// CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T.8b3 [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.1: type = import_ref Core//prelude, loc13_22, loaded [symbolic = @ImplicitAs.%Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Core.import_ref.ff5 = import_ref Core//prelude, inst67 [no loc], unloaded
+// CHECK:STDOUT:   %Core.import_ref.492: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type.ca0) = import_ref Core//prelude, loc14_35, loaded [symbolic = @ImplicitAs.%assoc0 (constants.%assoc0.dc0)]
+// CHECK:STDOUT:   %Core.Convert = import_ref Core//prelude, Convert, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.2: type = import_ref Core//prelude, loc13_22, loaded [symbolic = @ImplicitAs.%Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Core.import_ref.ce1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62) = import_ref Core//prelude, inst67 [no loc], loaded [symbolic = @ImplicitAs.%Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Core.import_ref.1c7: @ImplicitAs.%Convert.type (%Convert.type.275) = import_ref Core//prelude, loc14_35, loaded [symbolic = @ImplicitAs.%Convert (constants.%Convert.42e)]
+// CHECK:STDOUT:   %Core.import_ref.ad0 = import_ref Core//prelude, inst102 [no loc], unloaded
+// CHECK:STDOUT:   %Core.import_ref.02e = import_ref Core//prelude, loc18_41, unloaded
+// CHECK:STDOUT:   %Core.Op = import_ref Core//prelude, Op, unloaded
+// CHECK:STDOUT:   %Core.import_ref.f80 = import_ref Core//prelude, loc21_36, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.3: type = import_ref Core//prelude, loc21_14, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT:   %Core.import_ref.583: type = import_ref Core//prelude, loc21_24, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT:   %Core.import_ref.9c1: type = import_ref Core//prelude, loc21_29, loaded [concrete = constants.%BitAnd.type]
+// CHECK:STDOUT:   %Core.import_ref.bd4 = import_ref Core//prelude, loc22_42, unloaded
+// CHECK:STDOUT:   %Core.import_ref.5ab3ec.4: type = import_ref Core//prelude, loc21_14, loaded [symbolic = @impl.f92.%T (constants.%T.8b3)]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Ptr = %Ptr.decl
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Ptr.decl: type = interface_decl @Ptr [concrete = constants.%Ptr.type] {} {}
+// CHECK:STDOUT:   impl_decl @impl.a8e [concrete] {
+// CHECK:STDOUT:     %U.patt.loc7_20.1: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %U.ref.loc7_30: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %Ptr.ref: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %.Self: %Ptr.type = bind_symbolic_name .Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %.Self.ref: %Ptr.type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0.d28]
+// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.loc7_45: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.as_type]
+// CHECK:STDOUT:     %.Self.as_wit.iface0: <witness> = facet_access_witness %.Self.ref, element0 [symbolic_self = constants.%.Self.as_wit.iface0]
+// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access %.Self.as_wit.iface0, element0 [symbolic_self = constants.%impl.elem0.dff]
+// CHECK:STDOUT:     %U.ref.loc7_53: type = name_ref U, %U.loc7_20.1 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:     %ptr.loc7_54.1: type = ptr_type %U.ref.loc7_53 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:     %.loc7_39: type = where_expr %.Self [symbolic = %Ptr_where.type (constants.%Ptr_where.type)] {
+// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %ptr.loc7_54.1
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %U.loc7_20.1: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (%impl_witness_assoc_constant), @impl.a8e(constants.%U) [symbolic = @impl.a8e.%impl_witness (constants.%impl_witness.4de)]
+// CHECK:STDOUT:   %impl_witness_assoc_constant: type = impl_witness_assoc_constant constants.%ptr.79f [symbolic = @impl.a8e.%ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
+// CHECK:STDOUT:     %T.patt.loc9_6.1: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt.0a1)]
+// CHECK:STDOUT:     %t.patt: @F.%T.as_type.loc9_22.2 (%T.as_type) = binding_pattern t
+// CHECK:STDOUT:     %t.param_patt: @F.%T.as_type.loc9_22.2 (%T.as_type) = ref_param_pattern %t.patt, call_param0
+// CHECK:STDOUT:     %.loc9_15: @F.%T.as_type.loc9_22.2 (%T.as_type) = var_pattern %t.param_patt
+// CHECK:STDOUT:     %return.patt: @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) = return_slot_pattern
+// CHECK:STDOUT:     %return.param_patt: @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) = out_param_pattern %return.patt, call_param1
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref.loc9_28: %Ptr.type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T.972)]
+// CHECK:STDOUT:     %Ptr.ref.loc9_31: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %Type.ref: %Ptr.assoc_type = name_ref Type, @Type.%assoc0 [concrete = constants.%assoc0.d28]
+// CHECK:STDOUT:     %T.as_wit.iface0.loc9_29.1: <witness> = facet_access_witness %T.ref.loc9_28, element0 [symbolic = %T.as_wit.iface0.loc9_29.2 (constants.%T.as_wit.iface0)]
+// CHECK:STDOUT:     %impl.elem0.loc9_29.1: type = impl_witness_access %T.as_wit.iface0.loc9_29.1, element0 [symbolic = %impl.elem0.loc9_29.2 (constants.%impl.elem0.9f2)]
+// CHECK:STDOUT:     %Ptr.ref.loc9_10: type = name_ref Ptr, file.%Ptr.decl [concrete = constants.%Ptr.type]
+// CHECK:STDOUT:     %T.loc9_6.1: %Ptr.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T.972)]
+// CHECK:STDOUT:     %t.param: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = ref_param call_param0
+// CHECK:STDOUT:     %.loc9_22.1: type = splice_block %.loc9_22.2 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)] {
+// CHECK:STDOUT:       %T.ref.loc9_22: %Ptr.type = name_ref T, %T.loc9_6.1 [symbolic = %T.loc9_6.2 (constants.%T.972)]
+// CHECK:STDOUT:       %T.as_type.loc9_22.1: type = facet_access_type %T.ref.loc9_22 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:       %.loc9_22.2: type = converted %T.ref.loc9_22, %T.as_type.loc9_22.1 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %t: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = bind_name t, %t.param
+// CHECK:STDOUT:     %return.param: ref @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) = out_param call_param1
+// CHECK:STDOUT:     %return: ref @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) = return_slot %return.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @Ptr {
+// CHECK:STDOUT:   %Self: %Ptr.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.972]
+// CHECK:STDOUT:   %Type: type = assoc_const_decl @Type [concrete] {
+// CHECK:STDOUT:     %assoc0: %Ptr.assoc_type = assoc_entity element0, @Ptr.%Type [concrete = constants.%assoc0.d28]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = %Self
+// CHECK:STDOUT:   .Type = @Type.%assoc0
+// CHECK:STDOUT:   witness = (%Type)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @ImplicitAs(imports.%Core.import_ref.5ab3ec.1: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %Dest.patt: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt (constants.%Dest.patt)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.d62)]
+// CHECK:STDOUT:   %Self: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic = %Convert.type (constants.%Convert.type.275)]
+// CHECK:STDOUT:   %Convert: @ImplicitAs.%Convert.type (%Convert.type.275) = struct_value () [symbolic = %Convert (constants.%Convert.42e)]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic = %ImplicitAs.assoc_type (constants.%ImplicitAs.assoc_type.ca0)]
+// CHECK:STDOUT:   %assoc0: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type.ca0) = assoc_entity element0, imports.%Core.import_ref.1c7 [symbolic = %assoc0 (constants.%assoc0.9f5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%Core.import_ref.ff5
+// CHECK:STDOUT:     .Convert = imports.%Core.import_ref.492
+// CHECK:STDOUT:     witness = (imports.%Core.Convert)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @BitAnd [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%Core.import_ref.ad0
+// CHECK:STDOUT:   .Op = imports.%Core.import_ref.02e
+// CHECK:STDOUT:   witness = (imports.%Core.Op)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic assoc_const @Type(@Ptr.%Self: %Ptr.type) {
+// CHECK:STDOUT:   assoc_const Type:! type;
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.a8e(%U.loc7_20.1: type) {
+// CHECK:STDOUT:   %U.loc7_20.2: type = bind_symbolic_name U, 0 [symbolic = %U.loc7_20.2 (constants.%U)]
+// CHECK:STDOUT:   %U.patt.loc7_20.2: type = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc7_20.2 (constants.%U.patt)]
+// CHECK:STDOUT:   %ptr.loc7_54.2: type = ptr_type %U.loc7_20.2 [symbolic = %ptr.loc7_54.2 (constants.%ptr.79f)]
+// CHECK:STDOUT:   %Ptr_where.type: type = facet_type <@Ptr where constants.%impl.elem0.dff = %ptr.loc7_54.2> [symbolic = %Ptr_where.type (constants.%Ptr_where.type)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.a8e.%Ptr_where.type (%Ptr_where.type) [symbolic = %require_complete (constants.%require_complete.0dd)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (file.%impl_witness_assoc_constant), @impl.a8e(%U.loc7_20.2) [symbolic = %impl_witness (constants.%impl_witness.4de)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %U.ref.loc7_30 as %.loc7_39 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = file.%impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl.f92(imports.%Core.import_ref.5ab3ec.3: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T.8b3)]
+// CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt (constants.%T.patt.e01)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (imports.%Core.import_ref.bd4), @impl.f92(%T) [symbolic = %impl_witness (constants.%impl_witness.b81)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Op.type: type = fn_type @Op, @impl.f92(%T) [symbolic = %Op.type (constants.%Op.type)]
+// CHECK:STDOUT:   %Op: @impl.f92.%Op.type (%Op.type) = struct_value () [symbolic = %Op (constants.%Op)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.f92.%T (%T.8b3) [symbolic = %require_complete (constants.%require_complete.4ae)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: imports.%Core.import_ref.583 as imports.%Core.import_ref.9c1 {
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     witness = imports.%Core.import_ref.f80
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @F(%T.loc9_6.1: %Ptr.type) {
+// CHECK:STDOUT:   %T.loc9_6.2: %Ptr.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_6.2 (constants.%T.972)]
+// CHECK:STDOUT:   %T.patt.loc9_6.2: %Ptr.type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc9_6.2 (constants.%T.patt.0a1)]
+// CHECK:STDOUT:   %T.as_type.loc9_22.2: type = facet_access_type %T.loc9_6.2 [symbolic = %T.as_type.loc9_22.2 (constants.%T.as_type)]
+// CHECK:STDOUT:   %T.as_wit.iface0.loc9_29.2: <witness> = facet_access_witness %T.loc9_6.2, element0 [symbolic = %T.as_wit.iface0.loc9_29.2 (constants.%T.as_wit.iface0)]
+// CHECK:STDOUT:   %impl.elem0.loc9_29.2: type = impl_witness_access %T.as_wit.iface0.loc9_29.2, element0 [symbolic = %impl.elem0.loc9_29.2 (constants.%impl.elem0.9f2)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %require_complete.loc9_25: <witness> = require_complete_type @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) [symbolic = %require_complete.loc9_25 (constants.%require_complete.357)]
+// CHECK:STDOUT:   %require_complete.loc9_15: <witness> = require_complete_type @F.%T.as_type.loc9_22.2 (%T.as_type) [symbolic = %require_complete.loc9_15 (constants.%require_complete.020)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %T.as_type.loc9_22.2 [symbolic = %ptr (constants.%ptr.900)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%impl.elem0.loc9_29.2)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.73f)]
+// CHECK:STDOUT:   %require_complete.loc17: <witness> = require_complete_type @F.%ImplicitAs.type (%ImplicitAs.type.73f) [symbolic = %require_complete.loc17 (constants.%require_complete.5f0)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%T.patt.loc9_6.1: %Ptr.type](%.loc9_15: @F.%T.as_type.loc9_22.2 (%T.as_type)) -> @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) {
+// CHECK:STDOUT:   !entry:
+// CHECK:STDOUT:     %t.ref: ref @F.%T.as_type.loc9_22.2 (%T.as_type) = name_ref t, %t
+// CHECK:STDOUT:     %addr: @F.%ptr (%ptr.900) = addr_of %t.ref
+// CHECK:STDOUT:     %.loc17: @F.%impl.elem0.loc9_29.2 (%impl.elem0.9f2) = converted %addr, <error> [concrete = <error>]
+// CHECK:STDOUT:     return <error>
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert(imports.%Core.import_ref.5ab3ec.2: type, imports.%Core.import_ref.ce1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.d62)) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.d62)]
+// CHECK:STDOUT:   %Self: @Convert.%ImplicitAs.type (%ImplicitAs.type.d62) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.519)]
+// CHECK:STDOUT:   %Self.as_type: type = facet_access_type %Self [symbolic = %Self.as_type (constants.%Self.as_type)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Convert.%Self.as_type (%Self.as_type)]() -> @Convert.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Op(imports.%Core.import_ref.5ab3ec.4: type) [from "include_files/facet_types.carbon"] {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T.8b3)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Op.%T (%T.8b3)](%other.param_patt: @Op.%T (%T.8b3)) -> @Op.%T (%T.8b3) = "type.and";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Self.972) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.879) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.a8e(constants.%U) {
+// CHECK:STDOUT:   %U.loc7_20.2 => constants.%U
+// CHECK:STDOUT:   %U.patt.loc7_20.2 => constants.%U.patt
+// CHECK:STDOUT:   %ptr.loc7_54.2 => constants.%ptr.79f
+// CHECK:STDOUT:   %Ptr_where.type => constants.%Ptr_where.type
+// CHECK:STDOUT:   %require_complete => constants.%require_complete.0dd
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.4de
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.a8e(%U.loc7_20.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Type(constants.%Ptr.facet.7ad) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @F(constants.%T.972) {
+// CHECK:STDOUT:   %T.loc9_6.2 => constants.%T.972
+// CHECK:STDOUT:   %T.patt.loc9_6.2 => constants.%T.patt.0a1
+// CHECK:STDOUT:   %T.as_type.loc9_22.2 => constants.%T.as_type
+// CHECK:STDOUT:   %T.as_wit.iface0.loc9_29.2 => constants.%T.as_wit.iface0
+// CHECK:STDOUT:   %impl.elem0.loc9_29.2 => constants.%impl.elem0.9f2
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%Dest) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %Dest.patt => constants.%Dest.patt
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(@Convert.%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert(constants.%Dest, constants.%Self.519) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.d62
+// CHECK:STDOUT:   %Self => constants.%Self.519
+// CHECK:STDOUT:   %Self.as_type => constants.%Self.as_type
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%impl.elem0.9f2) {
+// CHECK:STDOUT:   %Dest => constants.%impl.elem0.9f2
+// CHECK:STDOUT:   %Dest.patt => constants.%Dest.patt
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.73f
+// CHECK:STDOUT:   %Self => constants.%Self.20d
+// CHECK:STDOUT:   %Convert.type => constants.%Convert.type.c52
+// CHECK:STDOUT:   %Convert => constants.%Convert.c34
+// CHECK:STDOUT:   %ImplicitAs.assoc_type => constants.%ImplicitAs.assoc_type.3d1
+// CHECK:STDOUT:   %assoc0 => constants.%assoc0.802
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.f92(constants.%T.8b3) {
+// CHECK:STDOUT:   %T => constants.%T.8b3
+// CHECK:STDOUT:   %T.patt => constants.%T.patt.e01
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness.b81
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl.f92(%T) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Op(constants.%T.8b3) {
+// CHECK:STDOUT:   %T => constants.%T.8b3
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(@F.%impl.elem0.loc9_29.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- include_files/facet_types.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic]
+// CHECK:STDOUT:   %Dest.patt: type = symbolic_binding_pattern Dest, 0 [symbolic]
+// CHECK:STDOUT:   %As.type.b51: type = generic_interface_type @As [concrete]
+// CHECK:STDOUT:   %As.generic: %As.type.b51 = struct_value () [concrete]
+// CHECK:STDOUT:   %As.type.8ba: type = facet_type <@As, @As(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.b4e: %As.type.8ba = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Self.as_type.7f0: type = facet_access_type %Self.b4e [symbolic]
+// CHECK:STDOUT:   %Convert.type.ad1: type = fn_type @Convert.1, @As(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.0ed: %Convert.type.ad1 = struct_value () [symbolic]
+// CHECK:STDOUT:   %As.assoc_type: type = assoc_entity_type @As, @As(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.1d5: %As.assoc_type = assoc_entity element0, @As.%Convert.decl [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.96f: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.96f = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.07f: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.0f3: %ImplicitAs.type.07f = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Self.as_type.419: type = facet_access_type %Self.0f3 [symbolic]
+// CHECK:STDOUT:   %Convert.type.4cf: type = fn_type @Convert.2, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.147: %Convert.type.4cf = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.8f8: %ImplicitAs.assoc_type = assoc_entity element0, @ImplicitAs.%Convert.decl [symbolic]
+// CHECK:STDOUT:   %BitAnd.type: type = facet_type <@BitAnd> [concrete]
+// CHECK:STDOUT:   %Self.e44: %BitAnd.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %Self.as_type.560: type = facet_access_type %Self.e44 [symbolic]
+// CHECK:STDOUT:   %Op.type.613: type = fn_type @Op.1 [concrete]
+// CHECK:STDOUT:   %Op.d98: %Op.type.613 = struct_value () [concrete]
+// CHECK:STDOUT:   %BitAnd.assoc_type: type = assoc_entity_type @BitAnd [concrete]
+// CHECK:STDOUT:   %assoc0.220: %BitAnd.assoc_type = assoc_entity element0, @BitAnd.%Op.decl [concrete]
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic]
+// CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%Op.decl), @impl(%T) [symbolic]
+// CHECK:STDOUT:   %Op.type.28d: type = fn_type @Op.2, @impl(%T) [symbolic]
+// CHECK:STDOUT:   %Op.902: %Op.type.28d = struct_value () [symbolic]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type %T [symbolic]
+// CHECK:STDOUT:   %BitAnd.facet: %BitAnd.type = facet_value %T, (%impl_witness) [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .As = %As.decl
+// CHECK:STDOUT:     .ImplicitAs = %ImplicitAs.decl
+// CHECK:STDOUT:     .BitAnd = %BitAnd.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %As.decl: %As.type.b51 = interface_decl @As [concrete = constants.%As.generic] {
+// CHECK:STDOUT:     %Dest.patt.loc9_14.1: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt.loc9_14.2 (constants.%Dest.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %Dest.loc9_14.1: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc9_14.2 (constants.%Dest)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %ImplicitAs.decl: %ImplicitAs.type.96f = interface_decl @ImplicitAs [concrete = constants.%ImplicitAs.generic] {
+// CHECK:STDOUT:     %Dest.patt.loc13_22.1: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt.loc13_22.2 (constants.%Dest.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %Dest.loc13_22.1: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc13_22.2 (constants.%Dest)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %BitAnd.decl: type = interface_decl @BitAnd [concrete = constants.%BitAnd.type] {} {}
+// CHECK:STDOUT:   impl_decl @impl [concrete] {
+// CHECK:STDOUT:     %T.patt.loc21_14.1: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc21_14.2 (constants.%T.patt)]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %T.ref: type = name_ref T, %T.loc21_14.1 [symbolic = %T.loc21_14.2 (constants.%T)]
+// CHECK:STDOUT:     %BitAnd.ref: type = name_ref BitAnd, file.%BitAnd.decl [concrete = constants.%BitAnd.type]
+// CHECK:STDOUT:     %T.loc21_14.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc21_14.2 (constants.%T)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%Op.decl), @impl(constants.%T) [symbolic = @impl.%impl_witness (constants.%impl_witness)]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @As(%Dest.loc9_14.1: type) {
+// CHECK:STDOUT:   %Dest.loc9_14.2: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc9_14.2 (constants.%Dest)]
+// CHECK:STDOUT:   %Dest.patt.loc9_14.2: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt.loc9_14.2 (constants.%Dest.patt)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %As.type: type = facet_type <@As, @As(%Dest.loc9_14.2)> [symbolic = %As.type (constants.%As.type.8ba)]
+// CHECK:STDOUT:   %Self.2: @As.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.b4e)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert.1, @As(%Dest.loc9_14.2) [symbolic = %Convert.type (constants.%Convert.type.ad1)]
+// CHECK:STDOUT:   %Convert: @As.%Convert.type (%Convert.type.ad1) = struct_value () [symbolic = %Convert (constants.%Convert.0ed)]
+// CHECK:STDOUT:   %As.assoc_type: type = assoc_entity_type @As, @As(%Dest.loc9_14.2) [symbolic = %As.assoc_type (constants.%As.assoc_type)]
+// CHECK:STDOUT:   %assoc0.loc10_35.2: @As.%As.assoc_type (%As.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc10_35.2 (constants.%assoc0.1d5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @As.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.b4e)]
+// CHECK:STDOUT:     %Convert.decl: @As.%Convert.type (%Convert.type.ad1) = fn_decl @Convert.1 [symbolic = @As.%Convert (constants.%Convert.0ed)] {
+// CHECK:STDOUT:       %self.patt: @Convert.1.%Self.as_type.loc10_20.1 (%Self.as_type.7f0) = binding_pattern self
+// CHECK:STDOUT:       %self.param_patt: @Convert.1.%Self.as_type.loc10_20.1 (%Self.as_type.7f0) = value_param_pattern %self.patt, call_param0
+// CHECK:STDOUT:       %return.patt: @Convert.1.%Dest (%Dest) = return_slot_pattern
+// CHECK:STDOUT:       %return.param_patt: @Convert.1.%Dest (%Dest) = out_param_pattern %return.patt, call_param1
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %Dest.ref: type = name_ref Dest, @As.%Dest.loc9_14.1 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:       %self.param: @Convert.1.%Self.as_type.loc10_20.1 (%Self.as_type.7f0) = value_param call_param0
+// CHECK:STDOUT:       %.loc10_20.1: type = splice_block %.loc10_20.3 [symbolic = %Self.as_type.loc10_20.1 (constants.%Self.as_type.7f0)] {
+// CHECK:STDOUT:         %.loc10_20.2: @Convert.1.%As.type (%As.type.8ba) = specific_constant @As.%Self.1, @As(constants.%Dest) [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:         %Self.ref: @Convert.1.%As.type (%As.type.8ba) = name_ref Self, %.loc10_20.2 [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:         %Self.as_type.loc10_20.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc10_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:         %.loc10_20.3: type = converted %Self.ref, %Self.as_type.loc10_20.2 [symbolic = %Self.as_type.loc10_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Convert.1.%Self.as_type.loc10_20.1 (%Self.as_type.7f0) = bind_name self, %self.param
+// CHECK:STDOUT:       %return.param: ref @Convert.1.%Dest (%Dest) = out_param call_param1
+// CHECK:STDOUT:       %return: ref @Convert.1.%Dest (%Dest) = return_slot %return.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %assoc0.loc10_35.1: @As.%As.assoc_type (%As.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc10_35.2 (constants.%assoc0.1d5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .Dest = <poisoned>
+// CHECK:STDOUT:     .Convert = %assoc0.loc10_35.1
+// CHECK:STDOUT:     witness = (%Convert.decl)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @ImplicitAs(%Dest.loc13_22.1: type) {
+// CHECK:STDOUT:   %Dest.loc13_22.2: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc13_22.2 (constants.%Dest)]
+// CHECK:STDOUT:   %Dest.patt.loc13_22.2: type = symbolic_binding_pattern Dest, 0 [symbolic = %Dest.patt.loc13_22.2 (constants.%Dest.patt)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest.loc13_22.2)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.07f)]
+// CHECK:STDOUT:   %Self.2: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.0f3)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert.2, @ImplicitAs(%Dest.loc13_22.2) [symbolic = %Convert.type (constants.%Convert.type.4cf)]
+// CHECK:STDOUT:   %Convert: @ImplicitAs.%Convert.type (%Convert.type.4cf) = struct_value () [symbolic = %Convert (constants.%Convert.147)]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest.loc13_22.2) [symbolic = %ImplicitAs.assoc_type (constants.%ImplicitAs.assoc_type)]
+// CHECK:STDOUT:   %assoc0.loc14_35.2: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc14_35.2 (constants.%assoc0.8f8)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.0f3)]
+// CHECK:STDOUT:     %Convert.decl: @ImplicitAs.%Convert.type (%Convert.type.4cf) = fn_decl @Convert.2 [symbolic = @ImplicitAs.%Convert (constants.%Convert.147)] {
+// CHECK:STDOUT:       %self.patt: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = binding_pattern self
+// CHECK:STDOUT:       %self.param_patt: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = value_param_pattern %self.patt, call_param0
+// CHECK:STDOUT:       %return.patt: @Convert.2.%Dest (%Dest) = return_slot_pattern
+// CHECK:STDOUT:       %return.param_patt: @Convert.2.%Dest (%Dest) = out_param_pattern %return.patt, call_param1
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %Dest.ref: type = name_ref Dest, @ImplicitAs.%Dest.loc13_22.1 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:       %self.param: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = value_param call_param0
+// CHECK:STDOUT:       %.loc14_20.1: type = splice_block %.loc14_20.3 [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)] {
+// CHECK:STDOUT:         %.loc14_20.2: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = specific_constant @ImplicitAs.%Self.1, @ImplicitAs(constants.%Dest) [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:         %Self.ref: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = name_ref Self, %.loc14_20.2 [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:         %Self.as_type.loc14_20.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:         %.loc14_20.3: type = converted %Self.ref, %Self.as_type.loc14_20.2 [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = bind_name self, %self.param
+// CHECK:STDOUT:       %return.param: ref @Convert.2.%Dest (%Dest) = out_param call_param1
+// CHECK:STDOUT:       %return: ref @Convert.2.%Dest (%Dest) = return_slot %return.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %assoc0.loc14_35.1: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc14_35.2 (constants.%assoc0.8f8)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .Dest = <poisoned>
+// CHECK:STDOUT:     .Convert = %assoc0.loc14_35.1
+// CHECK:STDOUT:     witness = (%Convert.decl)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: interface @BitAnd {
+// CHECK:STDOUT:   %Self: %BitAnd.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.e44]
+// CHECK:STDOUT:   %Op.decl: %Op.type.613 = fn_decl @Op.1 [concrete = constants.%Op.d98] {
+// CHECK:STDOUT:     %self.patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = binding_pattern self
+// CHECK:STDOUT:     %self.param_patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = value_param_pattern %self.patt, call_param0
+// CHECK:STDOUT:     %other.patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = binding_pattern other
+// CHECK:STDOUT:     %other.param_patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = value_param_pattern %other.patt, call_param1
+// CHECK:STDOUT:     %return.patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = return_slot_pattern
+// CHECK:STDOUT:     %return.param_patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = out_param_pattern %return.patt, call_param2
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %Self.ref.loc18_37: %BitAnd.type = name_ref Self, @BitAnd.%Self [symbolic = %Self (constants.%Self.e44)]
+// CHECK:STDOUT:     %Self.as_type.loc18_37: type = facet_access_type %Self.ref.loc18_37 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:     %.loc18_37: type = converted %Self.ref.loc18_37, %Self.as_type.loc18_37 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:     %self.param: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = value_param call_param0
+// CHECK:STDOUT:     %.loc18_15.1: type = splice_block %.loc18_15.2 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)] {
+// CHECK:STDOUT:       %Self.ref.loc18_15: %BitAnd.type = name_ref Self, @BitAnd.%Self [symbolic = %Self (constants.%Self.e44)]
+// CHECK:STDOUT:       %Self.as_type.loc18_15.2: type = facet_access_type %Self.ref.loc18_15 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:       %.loc18_15.2: type = converted %Self.ref.loc18_15, %Self.as_type.loc18_15.2 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %self: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = bind_name self, %self.param
+// CHECK:STDOUT:     %other.param: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = value_param call_param1
+// CHECK:STDOUT:     %.loc18_28.1: type = splice_block %.loc18_28.2 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)] {
+// CHECK:STDOUT:       %Self.ref.loc18_28: %BitAnd.type = name_ref Self, @BitAnd.%Self [symbolic = %Self (constants.%Self.e44)]
+// CHECK:STDOUT:       %Self.as_type.loc18_28: type = facet_access_type %Self.ref.loc18_28 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:       %.loc18_28.2: type = converted %Self.ref.loc18_28, %Self.as_type.loc18_28 [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %other: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = bind_name other, %other.param
+// CHECK:STDOUT:     %return.param: ref @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = out_param call_param2
+// CHECK:STDOUT:     %return: ref @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560) = return_slot %return.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %assoc0: %BitAnd.assoc_type = assoc_entity element0, %Op.decl [concrete = constants.%assoc0.220]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = %Self
+// CHECK:STDOUT:   .Op = %assoc0
+// CHECK:STDOUT:   witness = (%Op.decl)
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @impl(%T.loc21_14.1: type) {
+// CHECK:STDOUT:   %T.loc21_14.2: type = bind_symbolic_name T, 0 [symbolic = %T.loc21_14.2 (constants.%T)]
+// CHECK:STDOUT:   %T.patt.loc21_14.2: type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc21_14.2 (constants.%T.patt)]
+// CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (%Op.decl), @impl(%T.loc21_14.2) [symbolic = %impl_witness (constants.%impl_witness)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Op.type: type = fn_type @Op.2, @impl(%T.loc21_14.2) [symbolic = %Op.type (constants.%Op.type.28d)]
+// CHECK:STDOUT:   %Op: @impl.%Op.type (%Op.type.28d) = struct_value () [symbolic = %Op (constants.%Op.902)]
+// CHECK:STDOUT:   %require_complete: <witness> = require_complete_type @impl.%T.loc21_14.2 (%T) [symbolic = %require_complete (constants.%require_complete)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: %T.ref as %BitAnd.ref {
+// CHECK:STDOUT:     %Op.decl: @impl.%Op.type (%Op.type.28d) = fn_decl @Op.2 [symbolic = @impl.%Op (constants.%Op.902)] {
+// CHECK:STDOUT:       %self.patt: @Op.2.%T (%T) = binding_pattern self
+// CHECK:STDOUT:       %self.param_patt: @Op.2.%T (%T) = value_param_pattern %self.patt, call_param0
+// CHECK:STDOUT:       %other.patt: @Op.2.%T (%T) = binding_pattern other
+// CHECK:STDOUT:       %other.param_patt: @Op.2.%T (%T) = value_param_pattern %other.patt, call_param1
+// CHECK:STDOUT:       %return.patt: @Op.2.%T (%T) = return_slot_pattern
+// CHECK:STDOUT:       %return.param_patt: @Op.2.%T (%T) = out_param_pattern %return.patt, call_param2
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %Self.ref.loc22_37: type = name_ref Self, @impl.%T.ref [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:       %self.param: @Op.2.%T (%T) = value_param call_param0
+// CHECK:STDOUT:       %Self.ref.loc22_15: type = name_ref Self, @impl.%T.ref [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:       %self: @Op.2.%T (%T) = bind_name self, %self.param
+// CHECK:STDOUT:       %other.param: @Op.2.%T (%T) = value_param call_param1
+// CHECK:STDOUT:       %Self.ref.loc22_28: type = name_ref Self, @impl.%T.ref [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:       %other: @Op.2.%T (%T) = bind_name other, %other.param
+// CHECK:STDOUT:       %return.param: ref @Op.2.%T (%T) = out_param call_param2
+// CHECK:STDOUT:       %return: ref @Op.2.%T (%T) = return_slot %return.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %Op.decl
+// CHECK:STDOUT:     witness = file.%impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert.1(@As.%Dest.loc9_14.1: type, @As.%Self.1: @As.%As.type (%As.type.8ba)) {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %As.type: type = facet_type <@As, @As(%Dest)> [symbolic = %As.type (constants.%As.type.8ba)]
+// CHECK:STDOUT:   %Self: @Convert.1.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:   %Self.as_type.loc10_20.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc10_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Convert.1.%Self.as_type.loc10_20.1 (%Self.as_type.7f0)]() -> @Convert.1.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert.2(@ImplicitAs.%Dest.loc13_22.1: type, @ImplicitAs.%Self.1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f)) {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.07f)]
+// CHECK:STDOUT:   %Self: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:   %Self.as_type.loc14_20.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419)]() -> @Convert.2.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Op.1(@BitAnd.%Self: %BitAnd.type) {
+// CHECK:STDOUT:   %Self: %BitAnd.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self.e44)]
+// CHECK:STDOUT:   %Self.as_type.loc18_15.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc18_15.1 (constants.%Self.as_type.560)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560)](%other.param_patt: @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560)) -> @Op.1.%Self.as_type.loc18_15.1 (%Self.as_type.560);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Op.2(@impl.%T.loc21_14.1: type) {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn[%self.param_patt: @Op.2.%T (%T)](%other.param_patt: @Op.2.%T (%T)) -> @Op.2.%T (%T) = "type.and";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @As(constants.%Dest) {
+// CHECK:STDOUT:   %Dest.loc9_14.2 => constants.%Dest
+// CHECK:STDOUT:   %Dest.patt.loc9_14.2 => constants.%Dest.patt
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert.1(constants.%Dest, constants.%Self.b4e) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %As.type => constants.%As.type.8ba
+// CHECK:STDOUT:   %Self => constants.%Self.b4e
+// CHECK:STDOUT:   %Self.as_type.loc10_20.1 => constants.%Self.as_type.7f0
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @As(@Convert.1.%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @As(%Dest.loc9_14.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%Dest) {
+// CHECK:STDOUT:   %Dest.loc13_22.2 => constants.%Dest
+// CHECK:STDOUT:   %Dest.patt.loc13_22.2 => constants.%Dest.patt
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert.2(constants.%Dest, constants.%Self.0f3) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.07f
+// CHECK:STDOUT:   %Self => constants.%Self.0f3
+// CHECK:STDOUT:   %Self.as_type.loc14_20.1 => constants.%Self.as_type.419
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(@Convert.2.%Dest) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(%Dest.loc13_22.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Op.1(constants.%Self.e44) {
+// CHECK:STDOUT:   %Self => constants.%Self.e44
+// CHECK:STDOUT:   %Self.as_type.loc18_15.1 => constants.%Self.as_type.560
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(constants.%T) {
+// CHECK:STDOUT:   %T.loc21_14.2 => constants.%T
+// CHECK:STDOUT:   %T.patt.loc21_14.2 => constants.%T.patt
+// CHECK:STDOUT:   %impl_witness => constants.%impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @impl(%T.loc21_14.2) {}
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Op.2(constants.%T) {
+// CHECK:STDOUT:   %T => constants.%T
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Op.1(constants.%BitAnd.facet) {
+// CHECK:STDOUT:   %Self => constants.%BitAnd.facet
+// CHECK:STDOUT:   %Self.as_type.loc18_15.1 => constants.%T
+// CHECK:STDOUT: }
+// CHECK:STDOUT:

toolchain/sem_ir/impl.h

@@ -39,6 +39,9 @@ struct ImplFields {
   // TODO: Handle control flow in the impl body, such as if-expressions.
   InstBlockId body_block_id = InstBlockId::None;
 
+  // Whether the impl declaration is marked `final`.
+  bool is_final;
+
   // The following members are set at the `}` of the impl definition.
   bool defined = false;
 };