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carbon-lang/toolchain/check/testdata/interop/cpp/template/argument_count.carbon
T
Dana Jansens 24766e213e Defer evaluation of witnesses substituted while identifying a facet type (#7930) 
When identifying a facet type, defer evaluation of LookupImplWitnesses
by redirecting them to evaluate into IdentifiedWitness. Then the caller
of identify will need to substitute the IdentifiedWitnesses, either with
witnesses of their own, or with LookupImplWitness to cause a lookup
operation.

This allows:
- An `impl as` on a named constraint can subst the witnesses in
designators from the named constraint with a witness to the impl itself.
This prevents them from looking for and finding some other overlapping
impl. (This PR)
- Impl lookup to collect rewrite/equality requirements from all named
constraints and then use the impls it has already found to evaluate any
designators in those requirements instead of performing impl lookup
again (creating a cycle). (Done in
https://github.com/carbon-language/carbon-lang/pull/7944)
- Similarly, an `impl as` can collect impls and equality requirements
from all named constraints and verify them correctly by replacing
witnesses that should refer to the impl with the correct witness instead
of performing a lookup and finding an overlapping impl. (Done in
https://github.com/carbon-language/carbon-lang/pull/7937)
- ImplWitnessAccess to be able to find rewrites from a named constraint,
not just from the initial DeclaredFacetType. (TBD)

To do this we need to introduce the concept of "identified" specifics.
In order to identify a facet type, we must construct a specific for each
require decl in a named constraint. These specifics will have
IdentifiedWitnesses inside them, but their args would otherwise match a
specific for the require decl constructed in another context. To avoid
polluting the canonical specific namespace, we introduce a second
namespace of specifics that are "identified" since they are created by
identifying.

As we have introduced a new global state that modifies eval behaviour,
we must disable that state when resolving a specific (as per
https://github.com/carbon-language/carbon-lang/pull/7923). But inside an
"identified" specific, we preserve the behaviour so that the witnesses
modified by identify (through SubstPeriodSelf or through evaluating a
require specific) have their evaluation deferred.
2026-10-14 14:12:56 +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: --clang-arg=-std=c++20
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/template/argument_count.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/template/argument_count.carbon
// --- templates.h
struct A {};
struct B {};
template<typename T, typename U> struct TwoTypes {};
template<typename ...T> struct TypePack {};
template<typename, typename> concept True = true;
// FixedSizePack<T1, T2, ..., Tn>::Inner has a template parameter pack of fixed
// size `n`, because it's expanded to an arity of exactly `n` when instantiating
// the enclosing template, because the inner pack mentions the outer one.
template<typename ...T> struct FixedSizePack {
template<True<T> ...U> struct Inner {};
};
// --- valid.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
//@dump-sem-ir-begin
var x: Cpp.TwoTypes(Cpp.A, Cpp.B);
//@dump-sem-ir-end
// --- fail_too_few_arguments.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
// CHECK:STDERR: fail_too_few_arguments.carbon:[[@LINE+8]]:26: error: too few template arguments for class template 'TwoTypes' [CppInteropParseError]
// CHECK:STDERR: 14 | var x: Cpp.TwoTypes(Cpp.A);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_too_few_arguments.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:5:41: note: template is declared here [CppInteropParseNote]
// CHECK:STDERR: 5 | template<typename T, typename U> struct TwoTypes {};
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR:
var x: Cpp.TwoTypes(Cpp.A);
// --- fail_too_many_arguments.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
// CHECK:STDERR: fail_too_many_arguments.carbon:[[@LINE+8]]:40: error: too many template arguments for class template 'TwoTypes' [CppInteropParseError]
// CHECK:STDERR: 14 | var x: Cpp.TwoTypes(Cpp.A, Cpp.A, Cpp.A);
// CHECK:STDERR: | ~~^
// CHECK:STDERR: fail_too_many_arguments.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:5:41: note: template is declared here [CppInteropParseNote]
// CHECK:STDERR: 5 | template<typename T, typename U> struct TwoTypes {};
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR:
var x: Cpp.TwoTypes(Cpp.A, Cpp.A, Cpp.A);
// --- pack.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
//@dump-sem-ir-begin
var a0: Cpp.TypePack();
var a1: Cpp.TypePack(Cpp.A);
var a2: Cpp.TypePack(Cpp.A, Cpp.A);
var a3: Cpp.TypePack(Cpp.A, Cpp.A, Cpp.A);
//@dump-sem-ir-end
// --- fixed_size_pack.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
var x: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B);
// --- fail_fixed_size_pack_wrong_size.carbon
library "[[@TEST_NAME]]";
import Cpp library "templates.h";
// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE+8]]:57: error: too few template arguments for class template 'Inner' [CppInteropParseError]
// CHECK:STDERR: 14 | var too_few: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE-5]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:15:33: note: template is declared here [CppInteropParseNote]
// CHECK:STDERR: 15 | template<True<T> ...U> struct Inner {};
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR:
var too_few: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B);
// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE+8]]:72: error: too many template arguments for class template 'Inner' [CppInteropParseError]
// CHECK:STDERR: 24 | var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDERR: | ~~^
// CHECK:STDERR: fail_fixed_size_pack_wrong_size.carbon:[[@LINE-15]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./templates.h:15:33: note: template is declared here [CppInteropParseNote]
// CHECK:STDERR: 15 | template<True<T> ...U> struct Inner {};
// CHECK:STDERR: | ~~~~~~~~~~~~~~~~~~~~~~ ^
// CHECK:STDERR:
var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT: --- valid.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %TwoTypes: type = class_type @TwoTypes [concrete]
// CHECK:STDOUT: %pattern_type.83a: type = pattern_type %TwoTypes [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.83a = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.83a = var_pattern %x.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.b09: %Default.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.type.4da: type = fn_type @T.as_type.as.DefaultOrUnformed.impl.Op, @T.as_type.as.DefaultOrUnformed.impl(%T.b09) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.79f: %T.as_type.as.DefaultOrUnformed.impl.Op.type.4da = struct_value () [symbolic]
// CHECK:STDOUT: %TwoTypes.Op.type: type = fn_type @TwoTypes.Op [concrete]
// CHECK:STDOUT: %TwoTypes.Op: %TwoTypes.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b4: <witness> = custom_witness (%TwoTypes.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.49c: %Default.type = facet_value %TwoTypes, (%custom_witness.9b4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.04a: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.49c) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTypes, (%DefaultOrUnformed.impl_witness.04a) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.288: @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op.type (%T.as_type.as.DefaultOrUnformed.impl.Op.type.4da) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.as_type.as.DefaultOrUnformed.impl.Op.79f)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.162 = impl_witness_table (%Core.import_ref.288), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %x.var: ref %TwoTypes = var_storage %x.var_patt [concrete]
// CHECK:STDOUT: %x: ref %TwoTypes = wrapper_binding x, %x.var [concrete = %x.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.83a = ref_binding_pattern x [concrete = constants.%x.patt]
// CHECK:STDOUT: %x.var_patt: %pattern_type.83a = var_pattern %x.patt [concrete = constants.%x.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTypes, (constants.%DefaultOrUnformed.impl_witness.04a) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc7_34.1: %DefaultOrUnformed.type = converted constants.%TwoTypes, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc7_34.1 [concrete = constants.%TwoTypes]
// CHECK:STDOUT: %.loc7_34.2: type = converted %.loc7_34.1, %as_type [concrete = constants.%TwoTypes]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc7_1: ref %TwoTypes = splice_block file.%x.var [concrete = file.%x.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call: init %TwoTypes to %.loc7_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign file.%x.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- pack.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %TypePack.78f: type = class_type @TypePack.1 [concrete]
// CHECK:STDOUT: %pattern_type.a64: type = pattern_type %TypePack.78f [concrete]
// CHECK:STDOUT: %a0.patt: %pattern_type.a64 = ref_binding_pattern a0 [concrete]
// CHECK:STDOUT: %a0.var_patt: %pattern_type.a64 = var_pattern %a0.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.b09: %Default.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.type.4da: type = fn_type @T.as_type.as.DefaultOrUnformed.impl.Op, @T.as_type.as.DefaultOrUnformed.impl(%T.b09) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.79f: %T.as_type.as.DefaultOrUnformed.impl.Op.type.4da = struct_value () [symbolic]
// CHECK:STDOUT: %TypePack.Op.type.83af6e.1: type = fn_type @TypePack.Op.1 [concrete]
// CHECK:STDOUT: %TypePack.Op.4dca31.1: %TypePack.Op.type.83af6e.1 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b40fb.1: <witness> = custom_witness (%TypePack.Op.4dca31.1), @Default [concrete]
// CHECK:STDOUT: %Default.facet.7a3: %Default.type = facet_value %TypePack.78f, (%custom_witness.9b40fb.1) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.0cd: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.7a3) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.5df: %DefaultOrUnformed.type = facet_value %TypePack.78f, (%DefaultOrUnformed.impl_witness.0cd) [concrete]
// CHECK:STDOUT: %TypePack.0bc: type = class_type @TypePack.2 [concrete]
// CHECK:STDOUT: %pattern_type.20e: type = pattern_type %TypePack.0bc [concrete]
// CHECK:STDOUT: %a1.patt: %pattern_type.20e = ref_binding_pattern a1 [concrete]
// CHECK:STDOUT: %a1.var_patt: %pattern_type.20e = var_pattern %a1.patt [concrete]
// CHECK:STDOUT: %TypePack.Op.type.83af6e.2: type = fn_type @TypePack.Op.2 [concrete]
// CHECK:STDOUT: %TypePack.Op.4dca31.2: %TypePack.Op.type.83af6e.2 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b40fb.2: <witness> = custom_witness (%TypePack.Op.4dca31.2), @Default [concrete]
// CHECK:STDOUT: %Default.facet.2dd: %Default.type = facet_value %TypePack.0bc, (%custom_witness.9b40fb.2) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.09f: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.2dd) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.c45: %DefaultOrUnformed.type = facet_value %TypePack.0bc, (%DefaultOrUnformed.impl_witness.09f) [concrete]
// CHECK:STDOUT: %TypePack.0ec: type = class_type @TypePack.3 [concrete]
// CHECK:STDOUT: %pattern_type.c25: type = pattern_type %TypePack.0ec [concrete]
// CHECK:STDOUT: %a2.patt: %pattern_type.c25 = ref_binding_pattern a2 [concrete]
// CHECK:STDOUT: %a2.var_patt: %pattern_type.c25 = var_pattern %a2.patt [concrete]
// CHECK:STDOUT: %TypePack.Op.type.83af6e.3: type = fn_type @TypePack.Op.3 [concrete]
// CHECK:STDOUT: %TypePack.Op.4dca31.3: %TypePack.Op.type.83af6e.3 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b40fb.3: <witness> = custom_witness (%TypePack.Op.4dca31.3), @Default [concrete]
// CHECK:STDOUT: %Default.facet.3ab: %Default.type = facet_value %TypePack.0ec, (%custom_witness.9b40fb.3) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.2a6: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.3ab) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.fd8: %DefaultOrUnformed.type = facet_value %TypePack.0ec, (%DefaultOrUnformed.impl_witness.2a6) [concrete]
// CHECK:STDOUT: %TypePack.186: type = class_type @TypePack.4 [concrete]
// CHECK:STDOUT: %pattern_type.678: type = pattern_type %TypePack.186 [concrete]
// CHECK:STDOUT: %a3.patt: %pattern_type.678 = ref_binding_pattern a3 [concrete]
// CHECK:STDOUT: %a3.var_patt: %pattern_type.678 = var_pattern %a3.patt [concrete]
// CHECK:STDOUT: %TypePack.Op.type.83af6e.4: type = fn_type @TypePack.Op.4 [concrete]
// CHECK:STDOUT: %TypePack.Op.4dca31.4: %TypePack.Op.type.83af6e.4 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b40fb.4: <witness> = custom_witness (%TypePack.Op.4dca31.4), @Default [concrete]
// CHECK:STDOUT: %Default.facet.3c1: %Default.type = facet_value %TypePack.186, (%custom_witness.9b40fb.4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.971: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.3c1) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.eba: %DefaultOrUnformed.type = facet_value %TypePack.186, (%DefaultOrUnformed.impl_witness.971) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.288: @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op.type (%T.as_type.as.DefaultOrUnformed.impl.Op.type.4da) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.as_type.as.DefaultOrUnformed.impl.Op.79f)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.162 = impl_witness_table (%Core.import_ref.288), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %a0.var: ref %TypePack.78f = var_storage %a0.var_patt [concrete]
// CHECK:STDOUT: %a0: ref %TypePack.78f = wrapper_binding a0, %a0.var [concrete = %a0.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a0.patt: %pattern_type.a64 = ref_binding_pattern a0 [concrete = constants.%a0.patt]
// CHECK:STDOUT: %a0.var_patt: %pattern_type.a64 = var_pattern %a0.patt [concrete = constants.%a0.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a1.var: ref %TypePack.0bc = var_storage %a1.var_patt [concrete]
// CHECK:STDOUT: %a1: ref %TypePack.0bc = wrapper_binding a1, %a1.var [concrete = %a1.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a1.patt: %pattern_type.20e = ref_binding_pattern a1 [concrete = constants.%a1.patt]
// CHECK:STDOUT: %a1.var_patt: %pattern_type.20e = var_pattern %a1.patt [concrete = constants.%a1.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a2.var: ref %TypePack.0ec = var_storage %a2.var_patt [concrete]
// CHECK:STDOUT: %a2: ref %TypePack.0ec = wrapper_binding a2, %a2.var [concrete = %a2.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a2.patt: %pattern_type.c25 = ref_binding_pattern a2 [concrete = constants.%a2.patt]
// CHECK:STDOUT: %a2.var_patt: %pattern_type.c25 = var_pattern %a2.patt [concrete = constants.%a2.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a3.var: ref %TypePack.186 = var_storage %a3.var_patt [concrete]
// CHECK:STDOUT: %a3: ref %TypePack.186 = wrapper_binding a3, %a3.var [concrete = %a3.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a3.patt: %pattern_type.678 = ref_binding_pattern a3 [concrete = constants.%a3.patt]
// CHECK:STDOUT: %a3.var_patt: %pattern_type.678 = var_pattern %a3.patt [concrete = constants.%a3.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc7: %DefaultOrUnformed.type = facet_value constants.%TypePack.78f, (constants.%DefaultOrUnformed.impl_witness.0cd) [concrete = constants.%DefaultOrUnformed.facet.5df]
// CHECK:STDOUT: %.loc7_23.1: %DefaultOrUnformed.type = converted constants.%TypePack.78f, %DefaultOrUnformed.facet.loc7 [concrete = constants.%DefaultOrUnformed.facet.5df]
// CHECK:STDOUT: %as_type.loc7: type = facet_access_type %.loc7_23.1 [concrete = constants.%TypePack.78f]
// CHECK:STDOUT: %.loc7_23.2: type = converted %.loc7_23.1, %as_type.loc7 [concrete = constants.%TypePack.78f]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc7_1: ref %TypePack.78f = splice_block file.%a0.var [concrete = file.%a0.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc7: init %TypePack.78f to %.loc7_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.1()
// CHECK:STDOUT: assign file.%a0.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc7
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc8: %DefaultOrUnformed.type = facet_value constants.%TypePack.0bc, (constants.%DefaultOrUnformed.impl_witness.09f) [concrete = constants.%DefaultOrUnformed.facet.c45]
// CHECK:STDOUT: %.loc8_28.1: %DefaultOrUnformed.type = converted constants.%TypePack.0bc, %DefaultOrUnformed.facet.loc8 [concrete = constants.%DefaultOrUnformed.facet.c45]
// CHECK:STDOUT: %as_type.loc8: type = facet_access_type %.loc8_28.1 [concrete = constants.%TypePack.0bc]
// CHECK:STDOUT: %.loc8_28.2: type = converted %.loc8_28.1, %as_type.loc8 [concrete = constants.%TypePack.0bc]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc8_1: ref %TypePack.0bc = splice_block file.%a1.var [concrete = file.%a1.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc8: init %TypePack.0bc to %.loc8_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.2()
// CHECK:STDOUT: assign file.%a1.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc8
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc9: %DefaultOrUnformed.type = facet_value constants.%TypePack.0ec, (constants.%DefaultOrUnformed.impl_witness.2a6) [concrete = constants.%DefaultOrUnformed.facet.fd8]
// CHECK:STDOUT: %.loc9_35.1: %DefaultOrUnformed.type = converted constants.%TypePack.0ec, %DefaultOrUnformed.facet.loc9 [concrete = constants.%DefaultOrUnformed.facet.fd8]
// CHECK:STDOUT: %as_type.loc9: type = facet_access_type %.loc9_35.1 [concrete = constants.%TypePack.0ec]
// CHECK:STDOUT: %.loc9_35.2: type = converted %.loc9_35.1, %as_type.loc9 [concrete = constants.%TypePack.0ec]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc9_1: ref %TypePack.0ec = splice_block file.%a2.var [concrete = file.%a2.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc9: init %TypePack.0ec to %.loc9_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.3()
// CHECK:STDOUT: assign file.%a2.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc9
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc10: %DefaultOrUnformed.type = facet_value constants.%TypePack.186, (constants.%DefaultOrUnformed.impl_witness.971) [concrete = constants.%DefaultOrUnformed.facet.eba]
// CHECK:STDOUT: %.loc10_42.1: %DefaultOrUnformed.type = converted constants.%TypePack.186, %DefaultOrUnformed.facet.loc10 [concrete = constants.%DefaultOrUnformed.facet.eba]
// CHECK:STDOUT: %as_type.loc10: type = facet_access_type %.loc10_42.1 [concrete = constants.%TypePack.186]
// CHECK:STDOUT: %.loc10_42.2: type = converted %.loc10_42.1, %as_type.loc10 [concrete = constants.%TypePack.186]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc10_1: ref %TypePack.186 = splice_block file.%a3.var [concrete = file.%a3.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc10: init %TypePack.186 to %.loc10_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.4()
// CHECK:STDOUT: assign file.%a3.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc10
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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