carbon-lang/toolchain/check/testdata/named_constraint/require.carbon

// 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/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/named_constraint/require.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/named_constraint/require.carbon

// --- fail_todo_extend.carbon
library "[[@TEST_NAME]]";

interface Y {
  fn YY();
}

//@dump-sem-ir-begin
constraint Z {
  extend require impls Y;
}
//@dump-sem-ir-end

fn F(T:! Z) {
  // CHECK:STDERR: fail_todo_extend.carbon:[[@LINE+4]]:3: error: member name `YY` not found [MemberNameNotFound]
  // CHECK:STDERR:   T.YY();
  // CHECK:STDERR:   ^~~~
  // CHECK:STDERR:
  T.YY();
  T.(Y.YY)();
}

// --- implicit_self_impls.carbon
library "[[@TEST_NAME]]";

interface Y {
  fn YY();
}

//@dump-sem-ir-begin
constraint Z {
  require impls Y;
}
//@dump-sem-ir-end

fn F(T:! Z) {
  T.(Y.YY)();
}

// --- explicit_self_impls.carbon
library "[[@TEST_NAME]]";

interface Y {
  fn YY();
}

//@dump-sem-ir-begin
constraint Z {
  require Self impls Y;
}
//@dump-sem-ir-end

fn F(T:! Z) {
  T.(Y.YY)();
}

// --- fail_implicit_self_no_extend_name_lookup_fails.carbon
library "[[@TEST_NAME]]";

interface Y {
  fn YY();
}

constraint Z {
  require impls Y;
}

fn F(T:! Z) {
  // This should fail name lookup since Z does not extend Y.
  //
  // CHECK:STDERR: fail_implicit_self_no_extend_name_lookup_fails.carbon:[[@LINE+4]]:3: error: member name `YY` not found [MemberNameNotFound]
  // CHECK:STDERR:   T.YY();
  // CHECK:STDERR:   ^~~~
  // CHECK:STDERR:
  T.YY();
}

// --- fail_explicit_self_no_extend_name_lookup_fails.carbon
library "[[@TEST_NAME]]";

interface Y {
  fn YY();
}

constraint Z {
  require Self impls Y;
}

fn F(T:! Z) {
  // This should fail name lookup since Z does not extend Y.
  //
  // CHECK:STDERR: fail_explicit_self_no_extend_name_lookup_fails.carbon:[[@LINE+4]]:3: error: member name `YY` not found [MemberNameNotFound]
  // CHECK:STDERR:   T.YY();
  // CHECK:STDERR:   ^~~~
  // CHECK:STDERR:
  T.YY();
}

// --- explicit_self_specific_impls.carbon
library "[[@TEST_NAME]]";

interface Y {}

class C(T:! type);

//@dump-sem-ir-begin
constraint Z {
  require C(Self) impls Y;
}
//@dump-sem-ir-end

// --- require_impls_where.carbon
library "[[@TEST_NAME]]";

interface Y { let Y1:! type; }

//@dump-sem-ir-begin
constraint Z {
  require impls Y where .Y1 = ();
}
//@dump-sem-ir-end

// --- fail_require_impls_incomplete_constraint.carbon
library "[[@TEST_NAME]]";

constraint Y;

//@dump-sem-ir-begin
constraint Z {
  // CHECK:STDERR: fail_require_impls_incomplete_constraint.carbon:[[@LINE+7]]:17: error: facet type `Y` cannot be identified in `require` declaration [RequireImplsUnidentifiedFacetType]
  // CHECK:STDERR:   require impls Y;
  // CHECK:STDERR:                 ^
  // CHECK:STDERR: fail_require_impls_incomplete_constraint.carbon:[[@LINE-7]]:1: note: constraint was forward declared here [NamedConstraintForwardDeclaredHere]
  // CHECK:STDERR: constraint Y;
  // CHECK:STDERR: ^~~~~~~~~~~~~
  // CHECK:STDERR:
  require impls Y;
}
//@dump-sem-ir-end

// --- fail_require_impls_incomplete_self.carbon
library "[[@TEST_NAME]]";

//@dump-sem-ir-begin
constraint Z {
  // CHECK:STDERR: fail_require_impls_incomplete_self.carbon:[[@LINE+7]]:17: error: facet type `Z` cannot be identified in `require` declaration [RequireImplsUnidentifiedFacetType]
  // CHECK:STDERR:   require impls Z;
  // CHECK:STDERR:                 ^
  // CHECK:STDERR: fail_require_impls_incomplete_self.carbon:[[@LINE-4]]:1: note: constraint is currently being defined [NamedConstraintIncompleteWithinDefinition]
  // CHECK:STDERR: constraint Z {
  // CHECK:STDERR: ^~~~~~~~~~~~~~
  // CHECK:STDERR:
  require impls Z;
}
//@dump-sem-ir-end

// --- fail_require_impls_incomplete_self_specific.carbon
library "[[@TEST_NAME]]";

//@dump-sem-ir-begin
constraint Z(T:! type) {
  // CHECK:STDERR: fail_require_impls_incomplete_self_specific.carbon:[[@LINE+7]]:19: error: facet type `Z(Self)` cannot be identified in `require` declaration [RequireImplsUnidentifiedFacetType]
  // CHECK:STDERR:   require T impls Z(Self);
  // CHECK:STDERR:                   ^~~~~~~
  // CHECK:STDERR: fail_require_impls_incomplete_self_specific.carbon:[[@LINE-4]]:1: note: constraint is currently being defined [NamedConstraintIncompleteWithinDefinition]
  // CHECK:STDERR: constraint Z(T:! type) {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  require T impls Z(Self);
}
//@dump-sem-ir-end

// --- fail_require_impls_without_self.carbon
library "[[@TEST_NAME]]";

interface Y {
  let Y1:! type;
}

//@dump-sem-ir-begin
constraint Z(T:! type) {
  // Either the type `T` or the facet type `Y` must mention `Self` in a way that
  // it would appear in the type structure used for impl lookup (so inside a
  // `where` does not count). But they don't.
  //
  // CHECK:STDERR: fail_require_impls_without_self.carbon:[[@LINE+4]]:3: error: no `Self` reference found in `require` declaration; `Self` must appear in the self-type or as a generic parameter for each `interface` or `constraint` [RequireImplsMissingSelf]
  // CHECK:STDERR:   require T impls Y where .Y1 = Self;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  require T impls Y where .Y1 = Self;
}
//@dump-sem-ir-end

// --- fail_require_impls_without_self_in_one_interface.carbon
library "[[@TEST_NAME]]";

interface Y(T:! type) {}

constraint Z(T:! type) {
  // Self is in one interface but not the other.
  //
  // CHECK:STDERR: fail_require_impls_without_self_in_one_interface.carbon:[[@LINE+4]]:3: error: no `Self` reference found in `require` declaration; `Self` must appear in the self-type or as a generic parameter for each `interface` or `constraint` [RequireImplsMissingSelf]
  // CHECK:STDERR:   require T impls Y(Self) & Y({});
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  require T impls Y(Self) & Y({});
}

// --- fail_self_impls_self.carbon
library "[[@TEST_NAME]]";

constraint Z(T:! type) {
  // CHECK:STDERR: fail_self_impls_self.carbon:[[@LINE+4]]:17: error: `require` declaration constrained by a non-facet type; expected an `interface` or `constraint` name after `impls` [RequireImplsMissingFacetType]
  // CHECK:STDERR:   require impls Self;
  // CHECK:STDERR:                 ^~~~
  // CHECK:STDERR:
  require impls Self;
}

// --- fail_impls_type.carbon
library "[[@TEST_NAME]]";

class C(T:! type) {}

constraint Z(T:! type) {
  // CHECK:STDERR: fail_impls_type.carbon:[[@LINE+4]]:19: error: `require` declaration constrained by a non-facet type; expected an `interface` or `constraint` name after `impls` [RequireImplsMissingFacetType]
  // CHECK:STDERR:   require T impls C(Self);
  // CHECK:STDERR:                   ^~~~~~~
  // CHECK:STDERR:
  require T impls C(Self);
}

// --- fail_non_type_impls.carbon
library "[[@TEST_NAME]]";

interface Y {}

constraint Z(T:! type) {
  // CHECK:STDERR: fail_non_type_impls.carbon:[[@LINE+7]]:11: error: cannot implicitly convert non-type value of type `Core.IntLiteral` to `type` [ConversionFailureNonTypeToFacet]
  // CHECK:STDERR:   require 1 impls Y;
  // CHECK:STDERR:           ^
  // CHECK:STDERR: fail_non_type_impls.carbon:[[@LINE+4]]:11: note: type `Core.IntLiteral` does not implement interface `Core.ImplicitAs(type)` [MissingImplInMemberAccessNote]
  // CHECK:STDERR:   require 1 impls Y;
  // CHECK:STDERR:           ^
  // CHECK:STDERR:
  require 1 impls Y;
}

// --- fail_impls_non_type.carbon
library "[[@TEST_NAME]]";

interface Y {}

constraint Z(T:! type) {
  // CHECK:STDERR: fail_impls_non_type.carbon:[[@LINE+4]]:17: error: `require` declaration constrained by a non-facet type; expected an `interface` or `constraint` name after `impls` [RequireImplsMissingFacetType]
  // CHECK:STDERR:   require impls 1;
  // CHECK:STDERR:                 ^
  // CHECK:STDERR:
  require impls 1;
}

// --- require_self_in_requirement.carbon
library "[[@TEST_NAME]]";

interface Y {
  let Y1:! type;
}

//@dump-sem-ir-begin
constraint Z {
  // Self can appear in a requirement.
  require impls Y where .Y1 = Self;
}
//@dump-sem-ir-end

// CHECK:STDOUT: --- fail_todo_extend.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %Self.as_type impls %Y.ref
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Self.as_type: type = facet_access_type @Z.%Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%Self.as_type impls @Z.require0.%Y.ref
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- implicit_self_impls.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %Self.as_type impls %Y.ref
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Self.as_type: type = facet_access_type @Z.%Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%Self.as_type impls @Z.require0.%Y.ref
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- explicit_self_impls.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %.loc9 impls %Y.ref
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Self.ref: %Z.type = name_ref Self, @Z.%Self [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:     %Self.as_type: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %.loc9: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%.loc9 impls @Z.require0.%Y.ref
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- explicit_self_specific_impls.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %C.type: type = generic_class_type @C [concrete]
// CHECK:STDOUT:   %C.generic: %C.type = struct_value () [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT:   %C.42a: type = class_type @C, @C(%Self.binding.as_type) [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %C.loc9_17.1 impls %Y.ref
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %C.ref: %C.type = name_ref C, file.%C.decl [concrete = constants.%C.generic]
// CHECK:STDOUT:     %Self.ref: %Z.type = name_ref Self, @Z.%Self [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:     %Self.as_type: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %.loc9: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %C.loc9_17.1: type = class_type @C, @C(constants.%Self.binding.as_type) [symbolic = %C.loc9_17.2 (constants.%C.42a)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .C = <poisoned>
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%C.loc9_17.1 impls @Z.require0.%Y.ref
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:   %C.loc9_17.2: type = class_type @C, @C(%Self.binding.as_type) [symbolic = %C.loc9_17.2 (constants.%C.42a)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT:   %C.loc9_17.2 => constants.%C.42a
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- require_impls_where.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %Y.assoc_type: type = assoc_entity_type @Y [concrete]
// CHECK:STDOUT:   %assoc0: %Y.assoc_type = assoc_entity element0, @Y.%Y1 [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT:   %.Self: %Y.type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT:   %.Self.binding.as_type: type = symbolic_binding_type .Self, %.Self [symbolic_self]
// CHECK:STDOUT:   %Y.lookup_impl_witness: <witness> = lookup_impl_witness %.Self, @Y [symbolic_self]
// CHECK:STDOUT:   %impl.elem0: type = impl_witness_access %Y.lookup_impl_witness, element0 [symbolic_self]
// CHECK:STDOUT:   %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT:   %Y_where.type: type = facet_type <@Y where %impl.elem0 = %empty_tuple.type> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %Self.as_type impls %.loc7_19
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Self.as_type: type = facet_access_type @Z.%Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:     <elided>
// CHECK:STDOUT:     %.Self.ref: %Y.type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT:     %Y1.ref: %Y.assoc_type = name_ref Y1, @Y1.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT:     %.loc7_25: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access constants.%Y.lookup_impl_witness, element0 [symbolic_self = constants.%impl.elem0]
// CHECK:STDOUT:     %.loc7_32.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT:     %.loc7_32.2: type = converted %.loc7_32.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT:     %.loc7_19: type = where_expr %.Self [concrete = constants.%Y_where.type] {
// CHECK:STDOUT:       requirement_base_facet_type constants.%Y.type
// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %.loc7_32.2
// CHECK:STDOUT:     }
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%Self.as_type impls @Z.require0.%.loc7_19
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_require_impls_incomplete_constraint.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_require_impls_incomplete_self.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Z = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_require_impls_incomplete_self_specific.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT:   %pattern_type: type = pattern_type type [concrete]
// CHECK:STDOUT:   %Z.type.82a: type = generic_named_constaint_type @Z [concrete]
// CHECK:STDOUT:   %empty_struct: %Z.type.82a = struct_value () [concrete]
// CHECK:STDOUT:   %Z.type.b8d23b.1: type = facet_type <@Z, @Z(%T)> [symbolic]
// CHECK:STDOUT:   %Self: %Z.type.b8d23b.1 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 1, %Self [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: %Z.type.82a = constraint_decl @Z [concrete = constants.%empty_struct] {
// CHECK:STDOUT:     %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     <elided>
// CHECK:STDOUT:     %T.loc4_14.2: type = symbolic_binding T, 0 [symbolic = %T.loc4_14.1 (constants.%T)]
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic constraint @Z(%T.loc4_14.2: type) {
// CHECK:STDOUT:   %T.loc4_14.1: type = symbolic_binding T, 0 [symbolic = %T.loc4_14.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z, @Z(%T.loc4_14.1)> [symbolic = %Z.type (constants.%Z.type.b8d23b.1)]
// CHECK:STDOUT:   %Self.loc4_24.2: @Z.%Z.type (%Z.type.b8d23b.1) = symbolic_binding Self, 1 [symbolic = %Self.loc4_24.2 (constants.%Self)]
// CHECK:STDOUT:
// CHECK:STDOUT:   constraint {
// CHECK:STDOUT:     %Self.loc4_24.1: @Z.%Z.type (%Z.type.b8d23b.1) = symbolic_binding Self, 1 [symbolic = %Self.loc4_24.2 (constants.%Self)]
// CHECK:STDOUT:
// CHECK:STDOUT:   !members:
// CHECK:STDOUT:     .Self = %Self.loc4_24.1
// CHECK:STDOUT:     .T = <poisoned>
// CHECK:STDOUT:     .Z = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT:   !requires:
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z(constants.%T) {
// CHECK:STDOUT:   %T.loc4_14.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z(constants.%Self.binding.as_type) {
// CHECK:STDOUT:   %T.loc4_14.1 => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_require_impls_without_self.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT:   %pattern_type: type = pattern_type type [concrete]
// CHECK:STDOUT:   %Z.type.82a: type = generic_named_constaint_type @Z [concrete]
// CHECK:STDOUT:   %empty_struct: %Z.type.82a = struct_value () [concrete]
// CHECK:STDOUT:   %Z.type.b8d: type = facet_type <@Z, @Z(%T)> [symbolic]
// CHECK:STDOUT:   %Self.aa1: %Z.type.b8d = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: %Z.type.82a = constraint_decl @Z [concrete = constants.%empty_struct] {
// CHECK:STDOUT:     %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     <elided>
// CHECK:STDOUT:     %T.loc8_14.2: type = symbolic_binding T, 0 [symbolic = %T.loc8_14.1 (constants.%T)]
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic constraint @Z(%T.loc8_14.2: type) {
// CHECK:STDOUT:   %T.loc8_14.1: type = symbolic_binding T, 0 [symbolic = %T.loc8_14.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z, @Z(%T.loc8_14.1)> [symbolic = %Z.type (constants.%Z.type.b8d)]
// CHECK:STDOUT:   %Self.loc8_24.2: @Z.%Z.type (%Z.type.b8d) = symbolic_binding Self, 1 [symbolic = %Self.loc8_24.2 (constants.%Self.aa1)]
// CHECK:STDOUT:
// CHECK:STDOUT:   constraint {
// CHECK:STDOUT:     %Self.loc8_24.1: @Z.%Z.type (%Z.type.b8d) = symbolic_binding Self, 1 [symbolic = %Self.loc8_24.2 (constants.%Self.aa1)]
// CHECK:STDOUT:
// CHECK:STDOUT:   !members:
// CHECK:STDOUT:     .Self = %Self.loc8_24.1
// CHECK:STDOUT:     .T = <poisoned>
// CHECK:STDOUT:     .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT:   !requires:
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z(constants.%T) {
// CHECK:STDOUT:   %T.loc8_14.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- require_self_in_requirement.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT:   %Y.assoc_type: type = assoc_entity_type @Y [concrete]
// CHECK:STDOUT:   %assoc0: %Y.assoc_type = assoc_entity element0, @Y.%Y1 [concrete]
// CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT:   %Self.861: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.861 [symbolic]
// CHECK:STDOUT:   %.Self: %Y.type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT:   %.Self.binding.as_type: type = symbolic_binding_type .Self, %.Self [symbolic_self]
// CHECK:STDOUT:   %Y.lookup_impl_witness: <witness> = lookup_impl_witness %.Self, @Y [symbolic_self]
// CHECK:STDOUT:   %impl.elem0: type = impl_witness_access %Y.lookup_impl_witness, element0 [symbolic_self]
// CHECK:STDOUT:   %Y_where.type: type = facet_type <@Y where %impl.elem0 = %Self.binding.as_type> [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %Z.decl: type = constraint_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @Z {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.861]
// CHECK:STDOUT:   %Z.require0.decl = require_decl @Z.require0 [concrete] {
// CHECK:STDOUT:     require %Self.as_type.loc10_11 impls %.loc10_19
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Self.as_type.loc10_11: type = facet_access_type @Z.%Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT:     <elided>
// CHECK:STDOUT:     %.Self.ref: %Y.type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT:     %Y1.ref: %Y.assoc_type = name_ref Y1, @Y1.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT:     %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT:     %.loc10_25: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT:     %impl.elem0: type = impl_witness_access constants.%Y.lookup_impl_witness, element0 [symbolic_self = constants.%impl.elem0]
// CHECK:STDOUT:     %Self.ref: %Z.type = name_ref Self, @Z.%Self [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:     %Self.as_type.loc10_31: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %.loc10_31: type = converted %Self.ref, %Self.as_type.loc10_31 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:     %.loc10_19: type = where_expr %.Self [symbolic = %Y_where.type (constants.%Y_where.type)] {
// CHECK:STDOUT:       requirement_base_facet_type constants.%Y.type
// CHECK:STDOUT:       requirement_rewrite %impl.elem0, %.loc10_31
// CHECK:STDOUT:     }
// CHECK:STDOUT:   }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = %Self
// CHECK:STDOUT:   .Y = <poisoned>
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT:   @Z.require0 {
// CHECK:STDOUT:     require @Z.require0.%Self.as_type.loc10_11 impls @Z.require0.%.loc10_19
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @Z.require0(@Z.%Self: %Z.type) {
// CHECK:STDOUT:   %Self: %Z.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.861)]
// CHECK:STDOUT:   %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT:   %Y_where.type: type = facet_type <@Y where constants.%impl.elem0 = %Self.binding.as_type> [symbolic = %Y_where.type (constants.%Y_where.type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.require0(constants.%Self.861) {
// CHECK:STDOUT:   %Self => constants.%Self.861
// CHECK:STDOUT:   %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT:   %Y_where.type => constants.%Y_where.type
// CHECK:STDOUT: }
// CHECK:STDOUT: