[Carbon/C++ interop] Add support for int function params (#5197)

Added support for `int` function parameters. Currently only
pass-by-value is supported.

```c++
// hello_int.h;

auto foo_int(int a, int b) -> int;
```

```c++
// hello_int.cpp

#include "hello_int.h"
#include <cstdio>

auto foo_int(int a, int b) -> int {
    printf("a = %i \n", a);
    printf("b = %i \n", b);
    return a + b;
}
```
```c++
// main.carbon

library "Main";

import Cpp library "hello_int.h";
import Core library "io";

fn Carbon_foo(b: i32) {
  Core.Print(b);
}

fn Run() -> i32 {
  Carbon_foo(Cpp.foo_int(2, 8));
  return 0;
}
```

```
$ clang -c hello_int.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link hello_int.o main.o --output=demo
$ ./demo
a = 2 
b = 8 
10
```

Part of  #5064

toolchain/check/import_cpp.cpp

@@ -16,6 +16,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/raw_ostream.h"
 #include "toolchain/check/context.h"
+#include "toolchain/check/convert.h"
 #include "toolchain/check/diagnostic_helpers.h"
 #include "toolchain/check/import.h"
 #include "toolchain/check/inst.h"
@@ -26,6 +27,7 @@
 #include "toolchain/parse/node_ids.h"
 #include "toolchain/sem_ir/ids.h"
 #include "toolchain/sem_ir/name_scope.h"
+#include "toolchain/sem_ir/typed_insts.h"
 
 namespace Carbon::Check {
 
@@ -254,6 +256,74 @@ static auto ClangLookup(Context& context, SemIR::LocId loc_id,
   return lookup;
 }
 
+// Creates an integer type of the given size.
+static auto MakeIntType(Context& context, IntId size_id) -> TypeExpr {
+  // TODO: Fill in a location for the type once available.
+  auto type_inst_id = MakeIntTypeLiteral(context, Parse::NodeId::None,
+                                         SemIR::IntKind::Signed, size_id);
+  return ExprAsType(context, Parse::NodeId::None, type_inst_id);
+}
+
+// Maps a C++ type to a Carbon type. Currently only 32-bit `int` is supported.
+// TODO: Support more types.
+static auto MapType(Context& context, clang::QualType type) -> TypeExpr {
+  const auto* builtin_type = dyn_cast<clang::BuiltinType>(type);
+  if (builtin_type && builtin_type->getKind() == clang::BuiltinType::Int &&
+      context.ast_context().getTypeSize(type) == 32) {
+    return MakeIntType(context, context.ints().Add(32));
+  }
+  return {.inst_id = SemIR::ErrorInst::SingletonInstId,
+          .type_id = SemIR::ErrorInst::SingletonTypeId};
+}
+
+// Returns a block id for the explicit parameters of the given function
+// declaration. If the function declaration has no parameters, it returns
+// `SemIR::InstBlockId::Empty`. In the case of an unsupported parameter type, it
+// returns `SemIR::InstBlockId::None`.
+static auto MakeParamPatternsBlockId(Context& context, SemIR::LocId loc_id,
+                                     const clang::FunctionDecl& clang_decl)
+    -> SemIR::InstBlockId {
+  if (clang_decl.parameters().empty()) {
+    return SemIR::InstBlockId::Empty;
+  }
+  SemIR::CallParamIndex next_index(0);
+  llvm::SmallVector<SemIR::InstId> params;
+  params.reserve(clang_decl.parameters().size());
+  for (const clang::ParmVarDecl* param : clang_decl.parameters()) {
+    clang::QualType param_type = param->getType().getCanonicalType();
+    SemIR::TypeId type_id = MapType(context, param_type).type_id;
+    if (type_id == SemIR::ErrorInst::SingletonTypeId) {
+      context.TODO(loc_id, llvm::formatv("Unsupported: parameter type: {0}",
+                                         param_type.getAsString()));
+      return SemIR::InstBlockId::None;
+    }
+    llvm::StringRef param_name = param->getName();
+    SemIR::EntityNameId entity_name_id = context.entity_names().Add(
+        {.name_id =
+             (param_name.empty())
+                 // Translate an unnamed parameter to an underscore to
+                 // match Carbon's naming of unnamed/unused function params.
+                 ? SemIR::NameId::Underscore
+                 : SemIR::NameId::ForIdentifier(
+                       context.sem_ir().identifiers().Add(param_name)),
+         .parent_scope_id = SemIR::NameScopeId::None});
+    SemIR::InstId binding_pattern_id = AddInstInNoBlock(
+        // TODO: Fill in a location once available.
+        context, SemIR::LocIdAndInst::NoLoc(SemIR::BindingPattern(
+                     {.type_id = type_id, .entity_name_id = entity_name_id})));
+    SemIR::InstId var_pattern_id = AddInstInNoBlock(
+        context,
+        // TODO: Fill in a location once available.
+        SemIR::LocIdAndInst::NoLoc(SemIR::ValueParamPattern(
+            {.type_id = context.insts().Get(binding_pattern_id).type_id(),
+             .subpattern_id = binding_pattern_id,
+             .index = next_index})));
+    ++next_index.index;
+    params.push_back(var_pattern_id);
+  }
+  return context.inst_blocks().Add(params);
+}
+
 // Returns the return type of the given function declaration.
 // Currently only void and 32-bit int are supported.
 // TODO: Support more return types.
@@ -264,40 +334,23 @@ static auto GetReturnType(Context& context, SemIRLoc loc_id,
   if (ret_type->isVoidType()) {
     return SemIR::InstId::None;
   }
-  if (const auto* builtin_type = dyn_cast<clang::BuiltinType>(ret_type);
-      builtin_type && builtin_type->getKind() == clang::BuiltinType::Int) {
-    constexpr int SupportedIntWidth = 32;
-    uint64_t int_size = context.ast_context().getTypeSize(ret_type);
-    if (int_size != SupportedIntWidth) {
-      // TODO: Add tests for this case.
-      context.TODO(loc_id,
-                   llvm::formatv("Unsupported: return type: {0}, size: {1}",
-                                 ret_type.getAsString(), int_size));
-      return SemIR::ErrorInst::SingletonInstId;
-    }
-    IntId size_id = context.ints().Add(int_size);
-    // TODO: Fill in a location for the type once available.
-    SemIR::TypeId type_id = MakeIntType(context, Parse::NodeId::None,
-                                        SemIR::IntKind::Signed, size_id);
-    // TODO: Fill in a location for the type once available.
-    SemIR::InstId type_inst_id = MakeIntTypeLiteral(
-        context, Parse::NodeId::None, SemIR::IntKind::Signed, size_id);
-
-    SemIR::InstId return_slot_pattern_id = AddInstInNoBlock(
-        // TODO: Fill in a location for the return type once available.
-        context, SemIR::LocIdAndInst::NoLoc(SemIR::ReturnSlotPattern(
-                     {.type_id = type_id, .type_inst_id = type_inst_id})));
-    SemIR::InstId param_pattern_id = AddInstInNoBlock(
-        // TODO: Fill in a location for the return type once available.
-        context, SemIR::LocIdAndInst::NoLoc(SemIR::OutParamPattern(
-                     {.type_id = type_id,
-                      .subpattern_id = return_slot_pattern_id,
-                      .index = SemIR::CallParamIndex::None})));
-    return param_pattern_id;
+  auto [type_inst_id, type_id] = MapType(context, ret_type);
+  if (type_id == SemIR::ErrorInst::SingletonTypeId) {
+    context.TODO(loc_id, llvm::formatv("Unsupported: return type: {0}",
+                                       ret_type.getAsString()));
+    return SemIR::ErrorInst::SingletonInstId;
   }
-  context.TODO(loc_id, llvm::formatv("Unsupported: return type: {0}",
-                                     ret_type.getAsString()));
-  return SemIR::ErrorInst::SingletonInstId;
+  SemIR::InstId return_slot_pattern_id = AddInstInNoBlock(
+      // TODO: Fill in a location for the return type once available.
+      context, SemIR::LocIdAndInst::NoLoc(SemIR::ReturnSlotPattern(
+                   {.type_id = type_id, .type_inst_id = type_inst_id})));
+  SemIR::InstId param_pattern_id = AddInstInNoBlock(
+      // TODO: Fill in a location for the return type once available.
+      context, SemIR::LocIdAndInst::NoLoc(SemIR::OutParamPattern(
+                   {.type_id = type_id,
+                    .subpattern_id = return_slot_pattern_id,
+                    .index = SemIR::CallParamIndex::None})));
+  return param_pattern_id;
 }
 
 // Imports a function declaration from Clang to Carbon. If successful, returns
@@ -319,11 +372,11 @@ static auto ImportFunctionDecl(Context& context, SemIR::LocId loc_id,
     context.TODO(loc_id, "Unsupported: Template function");
     return SemIR::ErrorInst::SingletonInstId;
   }
-  if (!clang_decl->param_empty()) {
-    context.TODO(loc_id, "Unsupported: Function with parameters");
+  auto param_patterns_id =
+      MakeParamPatternsBlockId(context, loc_id, *clang_decl);
+  if (!param_patterns_id.has_value()) {
     return SemIR::ErrorInst::SingletonInstId;
   }
-
   auto return_slot_pattern_id = GetReturnType(context, loc_id, clang_decl);
   if (SemIR::ErrorInst::SingletonInstId == return_slot_pattern_id) {
     return SemIR::ErrorInst::SingletonInstId;
@@ -342,7 +395,7 @@ static auto ImportFunctionDecl(Context& context, SemIR::LocId loc_id,
        .last_param_node_id = Parse::NodeId::None,
        .pattern_block_id = SemIR::InstBlockId::Empty,
        .implicit_param_patterns_id = SemIR::InstBlockId::Empty,
-       .param_patterns_id = SemIR::InstBlockId::Empty,
+       .param_patterns_id = param_patterns_id,
        .is_extern = false,
        .extern_library_id = SemIR::LibraryNameId::None,
        .non_owning_decl_id = SemIR::InstId::None,

toolchain/check/testdata/interop/cpp/function_decl.carbon

@@ -45,6 +45,181 @@ fn F() {
   Cpp.foo_float();
 }
 
+// --- single_int_param_function_decl.h
+
+auto foo(int b) -> void;
+
+// --- import_single_int_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "single_int_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+// --- multiple_int_params_function_decl.h
+
+auto foo(int a, int b) -> void;
+
+// --- import_multiple_int_params_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "multiple_int_params_function_decl.h";
+
+fn F() {
+  Cpp.foo(1, 2);
+}
+
+// --- multiple_functions_with_int_params.h
+
+auto foo1(int a, int b) -> void;
+
+auto foo2(int c, int b) -> void;
+
+// --- import_multiple_functions_with_int_params.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "multiple_functions_with_int_params.h";
+
+fn F() {
+  Cpp.foo1(1, 2);
+  Cpp.foo2(3, 4);
+}
+
+// --- unnamed_int_param_function_decl.h
+
+auto foo(int) -> void;
+
+// --- import_unnamed_int_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "unnamed_int_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+// --- int_default_param_function_decl.h
+
+auto foo(int a = 0) -> void;
+
+// --- fail_int_default_param_parameterless_call.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_default_param_function_decl.h";
+
+fn F() {
+  // CHECK:STDERR: fail_int_default_param_parameterless_call.carbon:[[@LINE+5]]:3: error: 0 arguments passed to function expecting 1 argument [CallArgCountMismatch]
+  // CHECK:STDERR:   Cpp.foo();
+  // CHECK:STDERR:   ^~~~~~~~~
+  // CHECK:STDERR: fail_int_default_param_parameterless_call.carbon: note: calling function declared here [InCallToEntity]
+  // CHECK:STDERR:
+  Cpp.foo();
+}
+
+// --- import_int_default_param_sucessful_call_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_default_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+
+// --- int_ref_param_function_decl.h
+
+auto foo(int& a) -> int;
+
+// --- fail_int_ref_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_ref_param_function_decl.h";
+
+fn F() {
+  var a: i32 = 1;
+  // CHECK:STDERR: fail_int_ref_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int &` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_int_ref_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(a);
+}
+
+// --- int_pointer_param_function_decl.h
+
+auto foo(int* a) -> void;
+
+// --- fail_int_pointer_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_pointer_param_function_decl.h";
+
+fn F() {
+  var a: i32 = 1;
+  // CHECK:STDERR: fail_int_pointer_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int *` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(&a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_int_pointer_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(&a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(&a);
+}
+
+// --- unsupported_primitive_type_param_function_decl.h
+
+auto foo(float a) -> void;
+
+// --- fail_import_unsupported_primitive_type_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "unsupported_primitive_type_param_function_decl.h";
+
+fn F() {
+  // CHECK:STDERR: fail_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: float` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(1.1);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(1.1);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(1.1);
+}
+
+// --- unsupported_type_among_params_function_decl.h
+
+auto foo(int a, float b) -> void;
+
+// --- fail_import_unsupported_type_among_params_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "unsupported_type_among_params_function_decl.h";
+
+fn F() {
+  // CHECK:STDERR: fail_import_unsupported_type_among_params_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: float` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(1, 2.0);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_import_unsupported_type_among_params_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(1, 2.0);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(1, 2.0);
+}
+
 // CHECK:STDOUT: --- import_int_return_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
@@ -102,10 +277,8 @@ fn F() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %Carbon_foo.ref: %Carbon_foo.type = name_ref Carbon_foo, file.%Carbon_foo.decl [concrete = constants.%Carbon_foo]
 // CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
-// CHECK:STDOUT:   %int_32.1: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
-// CHECK:STDOUT:   %i32.1: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
-// CHECK:STDOUT:   %int_32.2: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
-// CHECK:STDOUT:   %i32.2: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
 // CHECK:STDOUT:   %foo_int.decl: %foo_int.type = fn_decl @foo_int [concrete = constants.%foo_int] {} {}
 // CHECK:STDOUT:   %foo_int.ref: %foo_int.type = name_ref foo_int, %foo_int.decl [concrete = constants.%foo_int]
 // CHECK:STDOUT:   %foo_int.call: init %i32 = call %foo_int.ref()
@@ -155,3 +328,706 @@ fn F() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: --- import_single_int_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "single_int_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo[](%b.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_multiple_int_params_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound.ab5: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method.9a1: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT:   %Convert.bound.ef9: <bound method> = bound_method %int_2.ecc, %Convert.956 [concrete]
+// CHECK:STDOUT:   %bound_method.b92: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_2.ef8: %i32 = int_value 2 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "multiple_int_params_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32.1: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.1: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %int_32.2: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.2: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
+// CHECK:STDOUT:   %impl.elem0.loc7_11: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0.loc7_11 [concrete = constants.%Convert.bound.ab5]
+// CHECK:STDOUT:   %specific_fn.loc7_11: <specific function> = specific_function %impl.elem0.loc7_11, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn.loc7_11 [concrete = constants.%bound_method.9a1]
+// CHECK:STDOUT:   %int.convert_checked.loc7_11: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked.loc7_11 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %impl.elem0.loc7_14: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_14.1: <bound method> = bound_method %int_2, %impl.elem0.loc7_14 [concrete = constants.%Convert.bound.ef9]
+// CHECK:STDOUT:   %specific_fn.loc7_14: <specific function> = specific_function %impl.elem0.loc7_14, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_14.2: <bound method> = bound_method %int_2, %specific_fn.loc7_14 [concrete = constants.%bound_method.b92]
+// CHECK:STDOUT:   %int.convert_checked.loc7_14: init %i32 = call %bound_method.loc7_14.2(%int_2) [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %.loc7_14.1: %i32 = value_of_initializer %int.convert_checked.loc7_14 [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %.loc7_14.2: %i32 = converted %int_2, %.loc7_14.1 [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2, %.loc7_14.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo[](%a.param_patt: %i32, %b.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_multiple_functions_with_int_params.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo1.type: type = fn_type @foo1 [concrete]
+// CHECK:STDOUT:   %foo1: %foo1.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound.ab5: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method.9a1: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT:   %Convert.bound.ef9: <bound method> = bound_method %int_2.ecc, %Convert.956 [concrete]
+// CHECK:STDOUT:   %bound_method.b92: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_2.ef8: %i32 = int_value 2 [concrete]
+// CHECK:STDOUT:   %foo2.type: type = fn_type @foo2 [concrete]
+// CHECK:STDOUT:   %foo2: %foo2.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_3.1ba: Core.IntLiteral = int_value 3 [concrete]
+// CHECK:STDOUT:   %int_4.0c1: Core.IntLiteral = int_value 4 [concrete]
+// CHECK:STDOUT:   %Convert.bound.b30: <bound method> = bound_method %int_3.1ba, %Convert.956 [concrete]
+// CHECK:STDOUT:   %bound_method.047: <bound method> = bound_method %int_3.1ba, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_3.822: %i32 = int_value 3 [concrete]
+// CHECK:STDOUT:   %Convert.bound.ac3: <bound method> = bound_method %int_4.0c1, %Convert.956 [concrete]
+// CHECK:STDOUT:   %bound_method.1da: <bound method> = bound_method %int_4.0c1, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_4.940: %i32 = int_value 4 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo1 = @F.%foo1.decl
+// CHECK:STDOUT:     .foo2 = @F.%foo2.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "multiple_functions_with_int_params.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref.loc7: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32.1: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.1: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %int_32.2: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.2: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo1.decl: %foo1.type = fn_decl @foo1 [concrete = constants.%foo1] {} {}
+// CHECK:STDOUT:   %foo1.ref: %foo1.type = name_ref foo1, %foo1.decl [concrete = constants.%foo1]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
+// CHECK:STDOUT:   %impl.elem0.loc7_12: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_12.1: <bound method> = bound_method %int_1, %impl.elem0.loc7_12 [concrete = constants.%Convert.bound.ab5]
+// CHECK:STDOUT:   %specific_fn.loc7_12: <specific function> = specific_function %impl.elem0.loc7_12, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_12.2: <bound method> = bound_method %int_1, %specific_fn.loc7_12 [concrete = constants.%bound_method.9a1]
+// CHECK:STDOUT:   %int.convert_checked.loc7_12: init %i32 = call %bound_method.loc7_12.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_12.1: %i32 = value_of_initializer %int.convert_checked.loc7_12 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_12.2: %i32 = converted %int_1, %.loc7_12.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %impl.elem0.loc7_15: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_15.1: <bound method> = bound_method %int_2, %impl.elem0.loc7_15 [concrete = constants.%Convert.bound.ef9]
+// CHECK:STDOUT:   %specific_fn.loc7_15: <specific function> = specific_function %impl.elem0.loc7_15, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_15.2: <bound method> = bound_method %int_2, %specific_fn.loc7_15 [concrete = constants.%bound_method.b92]
+// CHECK:STDOUT:   %int.convert_checked.loc7_15: init %i32 = call %bound_method.loc7_15.2(%int_2) [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %.loc7_15.1: %i32 = value_of_initializer %int.convert_checked.loc7_15 [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %.loc7_15.2: %i32 = converted %int_2, %.loc7_15.1 [concrete = constants.%int_2.ef8]
+// CHECK:STDOUT:   %foo1.call: init %empty_tuple.type = call %foo1.ref(%.loc7_12.2, %.loc7_15.2)
+// CHECK:STDOUT:   %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32.3: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.3: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %int_32.4: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32.4: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo2.decl: %foo2.type = fn_decl @foo2 [concrete = constants.%foo2] {} {}
+// CHECK:STDOUT:   %foo2.ref: %foo2.type = name_ref foo2, %foo2.decl [concrete = constants.%foo2]
+// CHECK:STDOUT:   %int_3: Core.IntLiteral = int_value 3 [concrete = constants.%int_3.1ba]
+// CHECK:STDOUT:   %int_4: Core.IntLiteral = int_value 4 [concrete = constants.%int_4.0c1]
+// CHECK:STDOUT:   %impl.elem0.loc8_12: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc8_12.1: <bound method> = bound_method %int_3, %impl.elem0.loc8_12 [concrete = constants.%Convert.bound.b30]
+// CHECK:STDOUT:   %specific_fn.loc8_12: <specific function> = specific_function %impl.elem0.loc8_12, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc8_12.2: <bound method> = bound_method %int_3, %specific_fn.loc8_12 [concrete = constants.%bound_method.047]
+// CHECK:STDOUT:   %int.convert_checked.loc8_12: init %i32 = call %bound_method.loc8_12.2(%int_3) [concrete = constants.%int_3.822]
+// CHECK:STDOUT:   %.loc8_12.1: %i32 = value_of_initializer %int.convert_checked.loc8_12 [concrete = constants.%int_3.822]
+// CHECK:STDOUT:   %.loc8_12.2: %i32 = converted %int_3, %.loc8_12.1 [concrete = constants.%int_3.822]
+// CHECK:STDOUT:   %impl.elem0.loc8_15: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc8_15.1: <bound method> = bound_method %int_4, %impl.elem0.loc8_15 [concrete = constants.%Convert.bound.ac3]
+// CHECK:STDOUT:   %specific_fn.loc8_15: <specific function> = specific_function %impl.elem0.loc8_15, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc8_15.2: <bound method> = bound_method %int_4, %specific_fn.loc8_15 [concrete = constants.%bound_method.1da]
+// CHECK:STDOUT:   %int.convert_checked.loc8_15: init %i32 = call %bound_method.loc8_15.2(%int_4) [concrete = constants.%int_4.940]
+// CHECK:STDOUT:   %.loc8_15.1: %i32 = value_of_initializer %int.convert_checked.loc8_15 [concrete = constants.%int_4.940]
+// CHECK:STDOUT:   %.loc8_15.2: %i32 = converted %int_4, %.loc8_15.1 [concrete = constants.%int_4.940]
+// CHECK:STDOUT:   %foo2.call: init %empty_tuple.type = call %foo2.ref(%.loc8_12.2, %.loc8_15.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo1[](%a.param_patt: %i32, %b.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo2[](%c.param_patt: %i32, %b.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_unnamed_int_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "unnamed_int_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo[](%_.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_int_default_param_parameterless_call.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_default_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo[](%a.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_int_default_param_sucessful_call_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_default_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo[](%a.param_patt: %i32);
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_int_ref_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_ref_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %a.patt: %i32 = binding_pattern a
+// CHECK:STDOUT:     %.loc7_3.1: %i32 = var_pattern %a.patt
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a.var: ref %i32 = var a
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_3.2: init %i32 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   assign %a.var, %.loc7_3.2
+// CHECK:STDOUT:   %.loc7_10: type = splice_block %i32 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a: ref %i32 = bind_name a, %a.var
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %a.ref: ref %i32 = name_ref a, %a
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_int_pointer_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %impl_witness.d39: <witness> = impl_witness (imports.%Core.import_ref.a5b), @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%impl_witness.d39) [concrete]
+// CHECK:STDOUT:   %.be7: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT:   %ptr: type = ptr_type %i32 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_pointer_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %a.patt: %i32 = binding_pattern a
+// CHECK:STDOUT:     %.loc7_3.1: %i32 = var_pattern %a.patt
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a.var: ref %i32 = var a
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.be7 = impl_witness_access constants.%impl_witness.d39, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_3.2: init %i32 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   assign %a.var, %.loc7_3.2
+// CHECK:STDOUT:   %.loc7_10: type = splice_block %i32 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a: ref %i32 = bind_name a, %a.var
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %a.ref: ref %i32 = name_ref a, %a
+// CHECK:STDOUT:   %addr: %ptr = addr_of %a.ref
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_import_unsupported_primitive_type_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %float: f64 = float_literal 1.1000000000000001 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "unsupported_primitive_type_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %float: f64 = float_literal 1.1000000000000001 [concrete = constants.%float]
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_import_unsupported_type_among_params_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %float: f64 = float_literal 2 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "unsupported_type_among_params_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1]
+// CHECK:STDOUT:   %float: f64 = float_literal 2 [concrete = constants.%float]
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:

toolchain/check/testdata/interop/cpp/no_prelude/function_decl.carbon

@@ -131,25 +131,27 @@ fn F() {
 // TODO: Test that template functions are unsupported.
 //       This is not tested because template functions are not considered a single result when doing lookup.
 
-// --- parameterized_function_decl.h
+// --- unsupported_param_type_function_decl.h
 
-void foo(int);
+struct S {};
 
-// --- fail_import_parameterized_function_decl.carbon
+auto foo(S) -> void;
+
+// --- fail_import_unsupported_param_type_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
-import Cpp library "parameterized_function_decl.h";
+import Cpp library "unsupported_param_type_function_decl.h";
 
 fn F() {
-  // CHECK:STDERR: fail_import_parameterized_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: Function with parameters` [SemanticsTodo]
-  // CHECK:STDERR:   Cpp.foo();
+  // CHECK:STDERR: fail_import_unsupported_param_type_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: struct S` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo({});
   // CHECK:STDERR:   ^~~~~~~
-  // CHECK:STDERR: fail_import_parameterized_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
-  // CHECK:STDERR:   Cpp.foo();
+  // CHECK:STDERR: fail_import_unsupported_param_type_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo({});
   // CHECK:STDERR:   ^~~~~~~
   // CHECK:STDERR:
-  Cpp.foo();
+  Cpp.foo({});
 }
 
 // --- non_void_return_function_decl.h
@@ -411,11 +413,12 @@ fn F() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_import_parameterized_function_decl.carbon
+// CHECK:STDOUT: --- fail_import_unsupported_param_type_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
 // CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -431,7 +434,7 @@ fn F() {
 // CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
-// CHECK:STDOUT:     import Cpp "parameterized_function_decl.h"
+// CHECK:STDOUT:     import Cpp "unsupported_param_type_function_decl.h"
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
 // CHECK:STDOUT: }
@@ -440,6 +443,7 @@ fn F() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
 // CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %.loc14: %empty_struct_type = struct_literal ()
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT: