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carbon-lang/toolchain/check/testdata/interface/final.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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/final.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/final.carbon
// --- require_complete_impl.carbon
//@include-in-dumps
library "[[@TEST_NAME]]";
interface I { fn F(); }
interface J {}
final impl forall [T: J] T as I { fn F() {} }
// This is creating an indirection where the `final impl` requires an indirect
// instantiation by the caller.
fn UseI(generic T: I) { T.F(); }
fn UseJ(generic T: J) { UseI(T); }
class C {}
impl C as J {}
fn Use() { UseJ(C); }
// CHECK:STDOUT: --- require_complete_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self.37e: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.type.de2: type = fn_type @I.WithSelf.F, @I.WithSelf(%Self.37e) [symbolic]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %I.WithSelf.F.20b: %I.WithSelf.F.type.de2 = struct_value () [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.WithSelf.%I.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %J.type: type = facet_type <@J> [concrete]
// CHECK:STDOUT: %Self.653: %J.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.2c5: type = pattern_type %J.type [concrete]
// CHECK:STDOUT: %T.patt.ac1: %pattern_type.2c5 = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.e40: %J.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.d90: type = facet_access_type %T.e40 [symbolic]
// CHECK:STDOUT: %.6ac: <witness> = impl_self_witness %T.e40, @I [symbolic]
// CHECK:STDOUT: %I.impl_witness.e22: <witness> = impl_witness @T.as_type.as.I.impl.%I.impl_witness_table, @T.as_type.as.I.impl(%T.e40) [symbolic]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.type.898: type = fn_type @T.as_type.as.I.impl.F, @T.as_type.as.I.impl(%T.e40) [symbolic]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.fed: %T.as_type.as.I.impl.F.type.898 = struct_value () [symbolic]
// CHECK:STDOUT: %I.facet.297: %I.type = facet_value %T.as_type.d90, (%I.impl_witness.e22) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.type.492: type = fn_type @I.WithSelf.F, @I.WithSelf(%I.facet.297) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.df6: %I.WithSelf.F.type.492 = struct_value () [symbolic]
// CHECK:STDOUT: %pattern_type.6cb: type = pattern_type %I.type [concrete]
// CHECK:STDOUT: %T.patt.1df: %pattern_type.6cb = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.dda: %I.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %UseI.type: type = fn_type @UseI [concrete]
// CHECK:STDOUT: %UseI: %UseI.type = struct_value () [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.eae: type = fn_type @I.WithSelf.F, @I.WithSelf(%T.dda) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.4b1: %I.WithSelf.F.type.eae = struct_value () [symbolic]
// CHECK:STDOUT: %T.as_type.b38: type = facet_access_type %T.dda [symbolic]
// CHECK:STDOUT: %I.lookup_impl_witness: <witness> = lookup_impl_witness %T.dda, @I [symbolic]
// CHECK:STDOUT: %.b94: type = fn_type_with_self_type %I.WithSelf.F.type.eae, %T.dda [symbolic]
// CHECK:STDOUT: %impl.elem0: %.b94 = impl_witness_access %I.lookup_impl_witness, element0 [symbolic]
// CHECK:STDOUT: %specific_impl_fn: <specific function> = specific_impl_function %impl.elem0, @I.WithSelf.F(%T.dda) [symbolic]
// CHECK:STDOUT: %UseJ.type: type = fn_type @UseJ [concrete]
// CHECK:STDOUT: %UseJ: %UseJ.type = struct_value () [concrete]
// CHECK:STDOUT: %.6cc: require_specific_def_type = require_specific_def @T.as_type.as.I.impl(%T.e40) [symbolic]
// CHECK:STDOUT: %UseI.specific_fn.95d: <specific function> = specific_function %UseI, @UseI(%I.facet.297) [symbolic]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %.ffd: <witness> = impl_self_witness %C, @J [concrete]
// CHECK:STDOUT: %J.impl_witness: <witness> = impl_witness @C.as.J.impl.%J.impl_witness_table [concrete]
// CHECK:STDOUT: %J.facet: %J.type = facet_value %C, (%J.impl_witness) [concrete]
// CHECK:STDOUT: %Use.type: type = fn_type @Use [concrete]
// CHECK:STDOUT: %Use: %Use.type = struct_value () [concrete]
// CHECK:STDOUT: %UseJ.specific_fn: <specific function> = specific_function %UseJ, @UseJ(%J.facet) [concrete]
// CHECK:STDOUT: %.d7c: type = fn_type_with_self_type %I.WithSelf.F.type.492, %I.facet.297 [symbolic]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.specific_fn.2f7: <specific function> = specific_function %T.as_type.as.I.impl.F.fed, @T.as_type.as.I.impl.F(%T.e40) [symbolic]
// CHECK:STDOUT: %.b7f: <witness> = impl_self_witness %C, @I [concrete]
// CHECK:STDOUT: %I.impl_witness.2ce: <witness> = impl_witness @T.as_type.as.I.impl.%I.impl_witness_table, @T.as_type.as.I.impl(%J.facet) [concrete]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.type.ad4: type = fn_type @T.as_type.as.I.impl.F, @T.as_type.as.I.impl(%J.facet) [concrete]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.9a9: %T.as_type.as.I.impl.F.type.ad4 = struct_value () [concrete]
// CHECK:STDOUT: %.109: require_specific_def_type = require_specific_def @T.as_type.as.I.impl(%J.facet) [concrete]
// CHECK:STDOUT: %I.facet.c8e: %I.type = facet_value %C, (%I.impl_witness.2ce) [concrete]
// CHECK:STDOUT: %UseI.specific_fn.0ef: <specific function> = specific_function %UseI, @UseI(%I.facet.c8e) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.151: type = fn_type @I.WithSelf.F, @I.WithSelf(%I.facet.c8e) [concrete]
// CHECK:STDOUT: %.e21: type = fn_type_with_self_type %I.WithSelf.F.type.151, %I.facet.c8e [concrete]
// CHECK:STDOUT: %T.as_type.as.I.impl.F.specific_fn.8c5: <specific function> = specific_function %T.as_type.as.I.impl.F.9a9, @T.as_type.as.I.impl.F(%J.facet) [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: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .J = %J.decl
// CHECK:STDOUT: .UseI = %UseI.decl
// CHECK:STDOUT: .UseJ = %UseJ.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .Use = %Use.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: %J.decl: type = interface_decl @J [concrete = constants.%J.type] {} {}
// CHECK:STDOUT: impl_decl @T.as_type.as.I.impl [concrete] {
// CHECK:STDOUT: %T.patt.loc7_21.1: %pattern_type.2c5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc7_21.2 (constants.%T.patt.ac1)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %T.ref: %J.type = name_ref T, %T.loc7_21.2 [symbolic = %T.loc7_21.1 (constants.%T.e40)]
// CHECK:STDOUT: %T.as_type.loc7_26.2: type = facet_access_type %T.ref [symbolic = %T.as_type.loc7_26.1 (constants.%T.as_type.d90)]
// CHECK:STDOUT: %.loc7_26: type = converted %T.ref, %T.as_type.loc7_26.2 [symbolic = %T.as_type.loc7_26.1 (constants.%T.as_type.d90)]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: %.loc7_23: type = splice_block %J.ref [concrete = constants.%J.type] {
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %J.ref: type = name_ref J, file.%J.decl [concrete = constants.%J.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc7_21.2: %J.type = symbolic_binding T, 0 [symbolic = %T.loc7_21.1 (constants.%T.e40)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc7: <witness> = impl_self_witness @T.as_type.as.I.impl.%.loc7_26, @I [symbolic = @T.as_type.as.I.impl.%.loc7_33 (constants.%.6ac)]
// CHECK:STDOUT: %UseI.decl: %UseI.type = fn_decl @UseI [concrete = constants.%UseI] {
// CHECK:STDOUT: %T.patt.loc11_18.1: %pattern_type.6cb = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc11_18.2 (constants.%T.patt.1df)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc11_20: type = splice_block %I.ref [concrete = constants.%I.type] {
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc11_18.2: %I.type = symbolic_binding T, 0 [symbolic = %T.loc11_18.1 (constants.%T.dda)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %UseJ.decl: %UseJ.type = fn_decl @UseJ [concrete = constants.%UseJ] {
// CHECK:STDOUT: %T.patt.loc12_18.1: %pattern_type.2c5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc12_18.2 (constants.%T.patt.ac1)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc12_20: type = splice_block %J.ref [concrete = constants.%J.type] {
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %J.ref: type = name_ref J, file.%J.decl [concrete = constants.%J.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc12_18.2: %J.type = symbolic_binding T, 0 [symbolic = %T.loc12_18.1 (constants.%T.e40)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: impl_decl @C.as.J.impl [concrete] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %J.ref: type = name_ref J, file.%J.decl [concrete = constants.%J.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc15: <witness> = impl_self_witness @C.as.J.impl.%C.ref, @J [concrete = constants.%.ffd]
// CHECK:STDOUT: %Use.decl: %Use.type = fn_decl @Use [concrete = constants.%Use] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self.37e]
// CHECK:STDOUT: %I.WithSelf.decl = interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %I.WithSelf.F.decl: @I.WithSelf.%I.WithSelf.F.type (%I.WithSelf.F.type.de2) = fn_decl @I.WithSelf.F [symbolic = @I.WithSelf.%I.WithSelf.F (constants.%I.WithSelf.F.20b)] {} {}
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @I.WithSelf.%assoc0
// CHECK:STDOUT: witness = (@I.WithSelf.%I.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @J {
// CHECK:STDOUT: %Self: %J.type = symbolic_binding Self, 0 [symbolic = constants.%Self.653]
// CHECK:STDOUT: %J.WithSelf.decl = interface_with_self_decl @J [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic final impl @T.as_type.as.I.impl(%T.loc7_21.2: %J.type) {
// CHECK:STDOUT: %T.patt.loc7_21.2: %pattern_type.2c5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc7_21.2 (constants.%T.patt.ac1)]
// CHECK:STDOUT: %T.loc7_21.1: %J.type = symbolic_binding T, 0 [symbolic = %T.loc7_21.1 (constants.%T.e40)]
// CHECK:STDOUT: %T.as_type.loc7_26.1: type = facet_access_type %T.loc7_21.1 [symbolic = %T.as_type.loc7_26.1 (constants.%T.as_type.d90)]
// CHECK:STDOUT: %.loc7_33: <witness> = impl_self_witness %T.loc7_21.1, @I [symbolic = %.loc7_33 (constants.%.6ac)]
// CHECK:STDOUT: %I.impl_witness.loc7_33.2: <witness> = impl_witness %I.impl_witness_table, @T.as_type.as.I.impl(%T.loc7_21.1) [symbolic = %I.impl_witness.loc7_33.2 (constants.%I.impl_witness.e22)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.as.I.impl.F.type: type = fn_type @T.as_type.as.I.impl.F, @T.as_type.as.I.impl(%T.loc7_21.1) [symbolic = %T.as_type.as.I.impl.F.type (constants.%T.as_type.as.I.impl.F.type.898)]
// CHECK:STDOUT: %T.as_type.as.I.impl.F: @T.as_type.as.I.impl.%T.as_type.as.I.impl.F.type (%T.as_type.as.I.impl.F.type.898) = struct_value () [symbolic = %T.as_type.as.I.impl.F (constants.%T.as_type.as.I.impl.F.fed)]
// CHECK:STDOUT:
// CHECK:STDOUT: final impl: %.loc7_26 as %I.ref {
// CHECK:STDOUT: %T.as_type.as.I.impl.F.decl: @T.as_type.as.I.impl.%T.as_type.as.I.impl.F.type (%T.as_type.as.I.impl.F.type.898) = fn_decl @T.as_type.as.I.impl.F [symbolic = @T.as_type.as.I.impl.%T.as_type.as.I.impl.F (constants.%T.as_type.as.I.impl.F.fed)] {} {}
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%T.as_type.as.I.impl.F.decl), @T.as_type.as.I.impl [concrete]
// CHECK:STDOUT: %I.impl_witness.loc7_33.1: <witness> = impl_witness %I.impl_witness_table, @T.as_type.as.I.impl(constants.%T.e40) [symbolic = %I.impl_witness.loc7_33.2 (constants.%I.impl_witness.e22)]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %T.as_type.as.I.impl.F.decl
// CHECK:STDOUT: extend %I.ref
// CHECK:STDOUT: witness = %I.impl_witness.loc7_33.1
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.J.impl: %C.ref as %J.ref {
// CHECK:STDOUT: %J.impl_witness_table = impl_witness_table (), @C.as.J.impl [concrete]
// CHECK:STDOUT: %J.impl_witness: <witness> = impl_witness %J.impl_witness_table [concrete = constants.%J.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %J.ref
// CHECK:STDOUT: witness = %J.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(@I.%Self: %I.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @T.as_type.as.I.impl.F(@T.as_type.as.I.impl.%T.loc7_21.2: %J.type) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @UseI(%T.loc11_18.2: %I.type) {
// CHECK:STDOUT: %T.patt.loc11_18.2: %pattern_type.6cb = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc11_18.2 (constants.%T.patt.1df)]
// CHECK:STDOUT: %T.loc11_18.1: %I.type = symbolic_binding T, 0 [symbolic = %T.loc11_18.1 (constants.%T.dda)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc11_26.2: type = facet_access_type %T.loc11_18.1 [symbolic = %T.as_type.loc11_26.2 (constants.%T.as_type.b38)]
// CHECK:STDOUT: %I.WithSelf.F.type: type = fn_type @I.WithSelf.F, @I.WithSelf(%T.loc11_18.1) [symbolic = %I.WithSelf.F.type (constants.%I.WithSelf.F.type.eae)]
// CHECK:STDOUT: %.loc11_26.2: type = fn_type_with_self_type %I.WithSelf.F.type, %T.loc11_18.1 [symbolic = %.loc11_26.2 (constants.%.b94)]
// CHECK:STDOUT: %I.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc11_18.1, @I [symbolic = %I.lookup_impl_witness (constants.%I.lookup_impl_witness)]
// CHECK:STDOUT: %impl.elem0.loc11_26.2: @UseI.%.loc11_26.2 (%.b94) = impl_witness_access %I.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc11_26.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %specific_impl_fn.loc11_26.2: <specific function> = specific_impl_function %impl.elem0.loc11_26.2, @I.WithSelf.F(%T.loc11_18.1) [symbolic = %specific_impl_fn.loc11_26.2 (constants.%specific_impl_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %T.ref: %I.type = name_ref T, %T.loc11_18.2 [symbolic = %T.loc11_18.1 (constants.%T.dda)]
// CHECK:STDOUT: %T.as_type.loc11_26.1: type = facet_access_type %T.ref [symbolic = %T.as_type.loc11_26.2 (constants.%T.as_type.b38)]
// CHECK:STDOUT: %.loc11_26.1: type = converted %T.ref, %T.as_type.loc11_26.1 [symbolic = %T.as_type.loc11_26.2 (constants.%T.as_type.b38)]
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, @I.WithSelf.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc11_26.1: @UseI.%.loc11_26.2 (%.b94) = impl_witness_access constants.%I.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc11_26.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %specific_impl_fn.loc11_26.1: <specific function> = specific_impl_function %impl.elem0.loc11_26.1, @I.WithSelf.F(constants.%T.dda) [symbolic = %specific_impl_fn.loc11_26.2 (constants.%specific_impl_fn)]
// CHECK:STDOUT: %I.WithSelf.F.call: init %empty_tuple.type = call %specific_impl_fn.loc11_26.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @UseJ(%T.loc12_18.2: %J.type) {
// CHECK:STDOUT: %T.patt.loc12_18.2: %pattern_type.2c5 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc12_18.2 (constants.%T.patt.ac1)]
// CHECK:STDOUT: %T.loc12_18.1: %J.type = symbolic_binding T, 0 [symbolic = %T.loc12_18.1 (constants.%T.e40)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc12_31.2: type = facet_access_type %T.loc12_18.1 [symbolic = %T.as_type.loc12_31.2 (constants.%T.as_type.d90)]
// CHECK:STDOUT: %.loc12_31.2: require_specific_def_type = require_specific_def @T.as_type.as.I.impl(%T.loc12_18.1) [symbolic = %.loc12_31.2 (constants.%.6cc)]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @T.as_type.as.I.impl.%I.impl_witness_table, @T.as_type.as.I.impl(%T.loc12_18.1) [symbolic = %I.impl_witness (constants.%I.impl_witness.e22)]
// CHECK:STDOUT: %I.facet.loc12_31.2: %I.type = facet_value %T.as_type.loc12_31.2, (%I.impl_witness) [symbolic = %I.facet.loc12_31.2 (constants.%I.facet.297)]
// CHECK:STDOUT: %UseI.specific_fn.loc12_25.2: <specific function> = specific_function constants.%UseI, @UseI(%I.facet.loc12_31.2) [symbolic = %UseI.specific_fn.loc12_25.2 (constants.%UseI.specific_fn.95d)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %UseI.ref: %UseI.type = name_ref UseI, file.%UseI.decl [concrete = constants.%UseI]
// CHECK:STDOUT: %T.ref: %J.type = name_ref T, %T.loc12_18.2 [symbolic = %T.loc12_18.1 (constants.%T.e40)]
// CHECK:STDOUT: %T.as_type.loc12_31.1: type = facet_access_type %T.ref [symbolic = %T.as_type.loc12_31.2 (constants.%T.as_type.d90)]
// CHECK:STDOUT: %I.facet.loc12_31.1: %I.type = facet_value %T.as_type.loc12_31.1, (constants.%I.impl_witness.e22) [symbolic = %I.facet.loc12_31.2 (constants.%I.facet.297)]
// CHECK:STDOUT: %.loc12_31.1: %I.type = converted %T.ref, %I.facet.loc12_31.1 [symbolic = %I.facet.loc12_31.2 (constants.%I.facet.297)]
// CHECK:STDOUT: %UseI.specific_fn.loc12_25.1: <specific function> = specific_function %UseI.ref, @UseI(constants.%I.facet.297) [symbolic = %UseI.specific_fn.loc12_25.2 (constants.%UseI.specific_fn.95d)]
// CHECK:STDOUT: %UseI.call: init %empty_tuple.type = call %UseI.specific_fn.loc12_25.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Use() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %UseJ.ref: %UseJ.type = name_ref UseJ, file.%UseJ.decl [concrete = constants.%UseJ]
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %J.facet: %J.type = facet_value %C.ref, (constants.%J.impl_witness) [concrete = constants.%J.facet]
// CHECK:STDOUT: %.loc16: %J.type = converted %C.ref, %J.facet [concrete = constants.%J.facet]
// CHECK:STDOUT: %UseJ.specific_fn: <specific function> = specific_function %UseJ.ref, @UseJ(constants.%J.facet) [concrete = constants.%UseJ.specific_fn]
// CHECK:STDOUT: %UseJ.call: init %empty_tuple.type = call %UseJ.specific_fn()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%Self.37e) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self.37e
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.de2
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.20b
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self.37e) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @J.WithSelf(constants.%Self.653) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.as_type.as.I.impl(constants.%T.e40) {
// CHECK:STDOUT: %T.patt.loc7_21.2 => constants.%T.patt.ac1
// CHECK:STDOUT: %T.loc7_21.1 => constants.%T.e40
// CHECK:STDOUT: %T.as_type.loc7_26.1 => constants.%T.as_type.d90
// CHECK:STDOUT: %.loc7_33 => constants.%.6ac
// CHECK:STDOUT: %I.impl_witness.loc7_33.2 => constants.%I.impl_witness.e22
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.as.I.impl.F.type => constants.%T.as_type.as.I.impl.F.type.898
// CHECK:STDOUT: %T.as_type.as.I.impl.F => constants.%T.as_type.as.I.impl.F.fed
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.as_type.as.I.impl.F(constants.%T.e40) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%I.facet.297) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%I.facet.297
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.492
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.df6
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%I.facet.297) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseI(constants.%T.dda) {
// CHECK:STDOUT: %T.patt.loc11_18.2 => constants.%T.patt.1df
// CHECK:STDOUT: %T.loc11_18.1 => constants.%T.dda
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%T.dda) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%T.dda
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.eae
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.4b1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%T.dda) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseJ(constants.%T.e40) {
// CHECK:STDOUT: %T.patt.loc12_18.2 => constants.%T.patt.ac1
// CHECK:STDOUT: %T.loc12_18.1 => constants.%T.e40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseI(constants.%I.facet.297) {
// CHECK:STDOUT: %T.patt.loc11_18.2 => constants.%T.patt.1df
// CHECK:STDOUT: %T.loc11_18.1 => constants.%I.facet.297
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc11_26.2 => constants.%T.as_type.d90
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.492
// CHECK:STDOUT: %.loc11_26.2 => constants.%.d7c
// CHECK:STDOUT: %I.lookup_impl_witness => constants.%I.impl_witness.e22
// CHECK:STDOUT: %impl.elem0.loc11_26.2 => constants.%T.as_type.as.I.impl.F.fed
// CHECK:STDOUT: %specific_impl_fn.loc11_26.2 => constants.%T.as_type.as.I.impl.F.specific_fn.2f7
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @J.WithSelf(constants.%J.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseJ(constants.%J.facet) {
// CHECK:STDOUT: %T.patt.loc12_18.2 => constants.%T.patt.ac1
// CHECK:STDOUT: %T.loc12_18.1 => constants.%J.facet
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc12_31.2 => constants.%C
// CHECK:STDOUT: %.loc12_31.2 => constants.%.109
// CHECK:STDOUT: %I.impl_witness => constants.%I.impl_witness.2ce
// CHECK:STDOUT: %I.facet.loc12_31.2 => constants.%I.facet.c8e
// CHECK:STDOUT: %UseI.specific_fn.loc12_25.2 => constants.%UseI.specific_fn.0ef
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.as_type.as.I.impl(constants.%J.facet) {
// CHECK:STDOUT: %T.patt.loc7_21.2 => constants.%T.patt.ac1
// CHECK:STDOUT: %T.loc7_21.1 => constants.%J.facet
// CHECK:STDOUT: %T.as_type.loc7_26.1 => constants.%C
// CHECK:STDOUT: %.loc7_33 => constants.%.b7f
// CHECK:STDOUT: %I.impl_witness.loc7_33.2 => constants.%I.impl_witness.2ce
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.as.I.impl.F.type => constants.%T.as_type.as.I.impl.F.type.ad4
// CHECK:STDOUT: %T.as_type.as.I.impl.F => constants.%T.as_type.as.I.impl.F.9a9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseI(constants.%I.facet.c8e) {
// CHECK:STDOUT: %T.patt.loc11_18.2 => constants.%T.patt.1df
// CHECK:STDOUT: %T.loc11_18.1 => constants.%I.facet.c8e
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %T.as_type.loc11_26.2 => constants.%C
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.151
// CHECK:STDOUT: %.loc11_26.2 => constants.%.e21
// CHECK:STDOUT: %I.lookup_impl_witness => constants.%I.impl_witness.2ce
// CHECK:STDOUT: %impl.elem0.loc11_26.2 => constants.%T.as_type.as.I.impl.F.9a9
// CHECK:STDOUT: %specific_impl_fn.loc11_26.2 => constants.%T.as_type.as.I.impl.F.specific_fn.8c5
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%I.facet.c8e) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%I.facet.c8e) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T.as_type.as.I.impl.F(constants.%J.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
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