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ca9e985fa8e1ad3fa5166b86ffc2a2fc3ac54ed4
carbon-lang/toolchain/check/testdata/function/definition/default_values.carbon
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Lucile Rose Nihlen ca9e985fa8 Reconcile function default values between decl and def (#7665) 
Updates the pattern matching code to support unspecified default values.
Adds logic to decl and def merge code to diagnose mismatches in defaults
if specified in both places, or if let entirely unspecified.

Per https://github.com/carbon-language/carbon-lang/pull/7521.
2026-09-08 20:41:58 +00:00

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// 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/int.carbon
// EXTRA-ARGS: --dump-sem-ir-ranges=only
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/definition/default_values.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/definition/default_values.carbon
//
// --- fail_default_presence_mismatch_redecl.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0, y: i32 = _, z: i32 = _);
// CHECK:STDERR: fail_default_presence_mismatch_redecl.carbon:[[@LINE+7]]:13: error: redeclaration differs at parameter 1 [RedeclParamDiffers]
// CHECK:STDERR: fn F(unused x: i32, unused y: i32 = 1, unused z: i32 = 2) { }
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_default_presence_mismatch_redecl.carbon:[[@LINE-4]]:6: note: previous declaration's corresponding parameter here [RedeclParamPrevious]
// CHECK:STDERR: fn F(x: i32 = 0, y: i32 = _, z: i32 = _);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
fn F(unused x: i32, unused y: i32 = 1, unused z: i32 = 2) { }
// --- fail_defaults_different_values_redecl.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0, y: i32 = 10);
// CHECK:STDERR: fail_defaults_different_values_redecl.carbon:[[@LINE+7]]:41: error: redeclaration syntax differs here [RedeclParamSyntaxDiffers]
// CHECK:STDERR: fn F(unused x: i32 = 0, unused y: i32 = 22) { }
// CHECK:STDERR: ^~
// CHECK:STDERR: fail_defaults_different_values_redecl.carbon:[[@LINE-4]]:27: note: comparing with previous declaration here [RedeclParamSyntaxPrevious]
// CHECK:STDERR: fn F(x: i32 = 0, y: i32 = 10);
// CHECK:STDERR: ^~
// CHECK:STDERR:
fn F(unused x: i32 = 0, unused y: i32 = 22) { }
// --- fail_defaults_never_specified_redecl.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = _);
// CHECK:STDERR: fail_defaults_never_specified_redecl.carbon:[[@LINE+7]]:6: error: no value for default number 0 is ever specified. [PatternDefaultValueNeverSpecified]
// CHECK:STDERR: fn F(unused x: i32 = _) { }
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_defaults_never_specified_redecl.carbon:[[@LINE-4]]:6: note: previous declaration here. [PatternDefaultValueNeverSpecifiedNote]
// CHECK:STDERR: fn F(x: i32 = _);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
fn F(unused x: i32 = _) { }
// --- default_presence_mismatch.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0, y: i32 = _, z: i32 = _);
// --- fail_default_presence_mismatch.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_default_presence_mismatch.impl.carbon:[[@LINE+8]]:13: error: redeclaration differs at parameter 1 [RedeclParamDiffers]
// CHECK:STDERR: fn F(unused x: i32, unused y: i32 = 1, unused z: i32 = 2) { }
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_default_presence_mismatch.impl.carbon:[[@LINE-5]]:1: in import [InImport]
// CHECK:STDERR: default_presence_mismatch.carbon:3:6: note: previous declaration's corresponding parameter here [RedeclParamPrevious]
// CHECK:STDERR: fn F(x: i32 = 0, y: i32 = _, z: i32 = _);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
fn F(unused x: i32, unused y: i32 = 1, unused z: i32 = 2) { }
// --- defaults_different_values.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0, y: i32 = 10);
// --- fail_defaults_different_values.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_defaults_different_values.impl.carbon:[[@LINE+4]]:25: error: default value differs from the previous declaration. [PatternDefaultValueDiffers]
// CHECK:STDERR: fn F(unused x: i32 = 0, unused y: i32 = 22) { }
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(unused x: i32 = 0, unused y: i32 = 22) { }
// --- defaults_never_specified.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = _);
// --- fail_defaults_never_specified.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_defaults_never_specified.impl.carbon:[[@LINE+4]]:6: error: no value for default number 0 is ever specified. [PatternDefaultValueNeverSpecified]
// CHECK:STDERR: fn F(unused x: i32 = _) { }
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(unused x: i32 = _) { }
// --- redecl.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0) -> i32;
fn G(x: i32 = _) -> i32;
fn H(x: i32 = 0) -> i32;
//@dump-sem-ir-begin
fn F(x: i32 = 0) -> i32 { return x; }
fn G(x: i32 = 0) -> i32 { return x; }
fn H(x: i32 = _) -> i32 { return x; }
//@dump-sem-ir-end
// --- repeated_defaults.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0) -> i32;
// --- repeated_defaults.impl.carbon
impl library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F(x: i32 = 0) -> i32 { return x; }
//@dump-sem-ir-end
// --- elided_defaults_in_def.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = 0) -> i32;
// --- elided_defaults_in_def.impl.carbon
impl library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F(x: i32 = _) -> i32 { return x; }
//@dump-sem-ir-end
// --- elided_defaults_in_decl.carbon
library "[[@TEST_NAME]]";
fn F(x: i32 = _) -> i32;
// --- elided_defaults_in_decl.impl.carbon
impl library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F(x: i32 = 0) -> i32 { return x; }
//@dump-sem-ir-end
// CHECK:STDOUT: --- redecl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %.e53: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete]
// CHECK:STDOUT: %.795f: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.a9a: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.e1b: %pattern_type.6b6 = return_slot_pattern %return.param_patt.a9a, %i32 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %.d49: <unspecified_value> = unspecified_value [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %H.type: type = fn_type @H [concrete]
// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.b51: <witness> = impl_witness imports.%Copy.impl_witness_table.8d2, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.3f6: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.4f6: %Int.as.Copy.impl.Op.type.3f6 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.b51) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.381: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.737: type = fn_type_with_self_type %Copy.WithSelf.Op.type.381, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.4f6, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.8d2 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl.loc8: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc8_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc8_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_0.loc8: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %i32.loc8_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc8_21: Core.Form = init_form %i32.loc8_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param.loc8: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc8_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x.loc8: %i32 = wrapper_binding x, %x.param.loc8
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %return.param.loc8: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return.loc8: ref %i32 = return_slot %return.param.loc8
// CHECK:STDOUT: }
// CHECK:STDOUT: %G.decl.loc9: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc9_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc9_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %i32.loc9_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc9_21: Core.Form = init_form %i32.loc9_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param.loc9: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc9_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x.loc9: %i32 = wrapper_binding x, %x.param.loc9
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %return.param.loc9: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return.loc9: ref %i32 = return_slot %return.param.loc9
// CHECK:STDOUT: }
// CHECK:STDOUT: %H.decl.loc10: %H.type = fn_decl @H [concrete = constants.%H] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc10_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc10_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc10_15: <unspecified_value> = unspecified_value [concrete = constants.%.d49]
// CHECK:STDOUT: %i32.loc10_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc10_21: Core.Form = init_form %i32.loc10_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param.loc10: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc10_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x.loc10: %i32 = wrapper_binding x, %x.param.loc10
// CHECK:STDOUT: %return.param.loc10: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return.loc10: ref %i32 = return_slot %return.param.loc10
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param.loc8: %i32) -> out %return.param.loc8: %i32 {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x.loc8
// CHECK:STDOUT: %impl.elem0.loc8: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc8_34.1: <bound method> = bound_method %x.ref, %impl.elem0.loc8
// CHECK:STDOUT: %specific_fn.loc8: <specific function> = specific_function %impl.elem0.loc8, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc8_34.2: <bound method> = bound_method %x.ref, %specific_fn.loc8
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc8_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%x.param.loc9: %i32) -> out %return.param.loc9: %i32 {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x.loc9
// CHECK:STDOUT: %impl.elem0.loc9: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc9_34.1: <bound method> = bound_method %x.ref, %impl.elem0.loc9
// CHECK:STDOUT: %specific_fn.loc9: <specific function> = specific_function %impl.elem0.loc9, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc9_34.2: <bound method> = bound_method %x.ref, %specific_fn.loc9
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc9_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @H(%x.param.loc10: %i32) -> out %return.param.loc10: %i32 {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x.loc10
// CHECK:STDOUT: %impl.elem0.loc10: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc10_34.1: <bound method> = bound_method %x.ref, %impl.elem0.loc10
// CHECK:STDOUT: %specific_fn.loc10: <specific function> = specific_function %impl.elem0.loc10, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc10_34.2: <bound method> = bound_method %x.ref, %specific_fn.loc10
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc10_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- repeated_defaults.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %.e53: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete]
// CHECK:STDOUT: %.795f: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.a9a: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.e1b: %pattern_type.6b6 = return_slot_pattern %return.param_patt.a9a, %i32 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.b51: <witness> = impl_witness imports.%Copy.impl_witness_table.8d2, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.3f6: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.4f6: %Int.as.Copy.impl.Op.type.3f6 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.b51) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.381: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.737: type = fn_type_with_self_type %Copy.WithSelf.Op.type.381, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.4f6, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.8d2 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc4_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc4_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %i32.loc4_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc4_21: Core.Form = init_form %i32.loc4_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc4_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x: %i32 = wrapper_binding x, %x.param
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param: %i32) -> out %return.param: %i32 [from "repeated_defaults.carbon"] {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x
// CHECK:STDOUT: %impl.elem0.loc4: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc4_34.1: <bound method> = bound_method %x.ref, %impl.elem0.loc4
// CHECK:STDOUT: %specific_fn.loc4: <specific function> = specific_function %impl.elem0.loc4, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc4_34.2: <bound method> = bound_method %x.ref, %specific_fn.loc4
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc4_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- elided_defaults_in_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete]
// CHECK:STDOUT: %.d49: <unspecified_value> = unspecified_value [concrete]
// CHECK:STDOUT: %.e53: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete]
// CHECK:STDOUT: %.795f: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.a9a: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.e1b: %pattern_type.6b6 = return_slot_pattern %return.param_patt.a9a, %i32 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.b51: <witness> = impl_witness imports.%Copy.impl_witness_table.8d2, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.3f6: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.4f6: %Int.as.Copy.impl.Op.type.3f6 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.b51) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.381: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.737: type = fn_type_with_self_type %Copy.WithSelf.Op.type.381, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.4f6, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.8d2 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc4_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc4_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc4_15: <unspecified_value> = unspecified_value [concrete = constants.%.d49]
// CHECK:STDOUT: %i32.loc4_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc4_21: Core.Form = init_form %i32.loc4_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc4_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x: %i32 = wrapper_binding x, %x.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param: %i32) -> out %return.param: %i32 [from "elided_defaults_in_def.carbon"] {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x
// CHECK:STDOUT: %impl.elem0: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc4_34.1: <bound method> = bound_method %x.ref, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc4_34.2: <bound method> = bound_method %x.ref, %specific_fn
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc4_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- elided_defaults_in_decl.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %.e53: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete]
// CHECK:STDOUT: %.795f: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.a9a: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.e1b: %pattern_type.6b6 = return_slot_pattern %return.param_patt.a9a, %i32 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.b51: <witness> = impl_witness imports.%Copy.impl_witness_table.8d2, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.3f6: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.4f6: %Int.as.Copy.impl.Op.type.3f6 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.b51) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.381: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.737: type = fn_type_with_self_type %Copy.WithSelf.Op.type.381, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.4f6, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.8d2 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: %.loc4_13: %pattern_type.6b6 = default_value_pattern %x.patt, index: 0 [concrete = constants.%.e53]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32.loc4_21 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %i32.loc4_21: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc4_21: Core.Form = init_form %i32.loc4_21 [concrete = constants.%.795f]
// CHECK:STDOUT: %x.param: %i32 = value_param call_param0
// CHECK:STDOUT: %i32.loc4_9: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x: %i32 = wrapper_binding x, %x.param
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param: %i32) -> out %return.param: %i32 [from "elided_defaults_in_decl.carbon"] {
// CHECK:STDOUT: !default_values:
// CHECK:STDOUT: constants.%int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref: %i32 = name_ref x, %x
// CHECK:STDOUT: %impl.elem0.loc4: %.737 = impl_witness_access constants.%Copy.impl_witness.b51, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc4_34.1: <bound method> = bound_method %x.ref, %impl.elem0.loc4
// CHECK:STDOUT: %specific_fn.loc4: <specific function> = specific_function %impl.elem0.loc4, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc4_34.2: <bound method> = bound_method %x.ref, %specific_fn.loc4
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc4_34.2(%x.ref)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
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