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carbon-lang/toolchain/check/testdata/interface/import.carbon
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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
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/import.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/import.carbon
// --- a.carbon
library "[[@TEST_NAME]]";
interface Empty {
}
interface Basic {
let T: type;
fn F();
}
// TODO: Implement merging of interface on import.
// interface ForwardDeclared;
interface ForwardDeclared {
let T: type;
fn F();
}
var f_ref: {.f: ForwardDeclared};
// --- b.carbon
library "[[@TEST_NAME]]";
import library "a";
fn UseEmpty(unused e: Empty) {}
fn UseBasic(unused e: Basic) {}
fn UseForwardDeclared(unused f: ForwardDeclared) {}
alias UseBasicT = Basic.T;
alias UseBasicF = Basic.F;
alias UseForwardDeclaredT = ForwardDeclared.T;
alias UseForwardDeclaredF = ForwardDeclared.F;
var f: ForwardDeclared* = &f_ref.f;
// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Empty.type: type = facet_type <@Empty> [concrete]
// CHECK:STDOUT: %Self.d44: %Empty.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Basic.type: type = facet_type <@Basic> [concrete]
// CHECK:STDOUT: %Self.89c: %Basic.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Basic.assoc_type: type = assoc_entity_type @Basic [concrete]
// CHECK:STDOUT: %assoc0.05f: %Basic.assoc_type = assoc_entity element0, @Basic.WithSelf.%T [concrete]
// CHECK:STDOUT: %Basic.WithSelf.F.type: type = fn_type @Basic.WithSelf.F, @Basic.WithSelf(%Self.89c) [symbolic]
// CHECK:STDOUT: %Basic.WithSelf.F: %Basic.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %assoc1.de2: %Basic.assoc_type = assoc_entity element1, @Basic.WithSelf.%Basic.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %ForwardDeclared.type: type = facet_type <@ForwardDeclared> [concrete]
// CHECK:STDOUT: %Self.d56: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %ForwardDeclared.assoc_type: type = assoc_entity_type @ForwardDeclared [concrete]
// CHECK:STDOUT: %assoc0.10f: %ForwardDeclared.assoc_type = assoc_entity element0, @ForwardDeclared.WithSelf.%T [concrete]
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.type: type = fn_type @ForwardDeclared.WithSelf.F, @ForwardDeclared.WithSelf(%Self.d56) [symbolic]
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F: %ForwardDeclared.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %assoc1.18a: %ForwardDeclared.assoc_type = assoc_entity element1, @ForwardDeclared.WithSelf.%ForwardDeclared.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete]
// CHECK:STDOUT: %pattern_type.1c1: type = pattern_type %struct_type.f [concrete]
// CHECK:STDOUT: %f_ref.patt: %pattern_type.1c1 = ref_binding_pattern f_ref [concrete]
// CHECK:STDOUT: %f_ref.var_patt: %pattern_type.1c1 = var_pattern %f_ref.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.5f6: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.5c0: %T.as.DefaultOrUnformed.impl.Op.type.5f6 = struct_value () [symbolic]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.c8a: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.856, @T.as.DefaultOrUnformed.impl(%struct_type.f) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.3f8: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%struct_type.f) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.11c: %T.as.DefaultOrUnformed.impl.Op.type.3f8 = struct_value () [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %struct_type.f, (%DefaultOrUnformed.impl_witness.c8a) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function %T.as.DefaultOrUnformed.impl.Op.11c, @T.as.DefaultOrUnformed.impl.Op(%struct_type.f) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .DefaultOrUnformed = %Core.DefaultOrUnformed
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.DefaultOrUnformed: type = import_ref Core//prelude/parts/default, DefaultOrUnformed, loaded [concrete = constants.%DefaultOrUnformed.type]
// CHECK:STDOUT: %Core.import_ref.002: @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op.type (%T.as.DefaultOrUnformed.impl.Op.type.5f6) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op (constants.%T.as.DefaultOrUnformed.impl.Op.5c0)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.856 = impl_witness_table (%Core.import_ref.002), @T.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Empty = %Empty.decl
// CHECK:STDOUT: .Basic = %Basic.decl
// CHECK:STDOUT: .ForwardDeclared = %ForwardDeclared.decl
// CHECK:STDOUT: .f_ref = %f_ref
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Empty.decl: type = interface_decl @Empty [concrete = constants.%Empty.type] {} {}
// CHECK:STDOUT: %Basic.decl: type = interface_decl @Basic [concrete = constants.%Basic.type] {} {}
// CHECK:STDOUT: %ForwardDeclared.decl: type = interface_decl @ForwardDeclared [concrete = constants.%ForwardDeclared.type] {} {}
// CHECK:STDOUT: %f_ref.var: ref %struct_type.f = var_storage %f_ref.var_patt [concrete]
// CHECK:STDOUT: %.loc20: type = splice_block %struct_type.f [concrete = constants.%struct_type.f] {
// CHECK:STDOUT: %ForwardDeclared.ref: type = name_ref ForwardDeclared, %ForwardDeclared.decl [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete = constants.%struct_type.f]
// CHECK:STDOUT: }
// CHECK:STDOUT: %f_ref: ref %struct_type.f = wrapper_binding f_ref, %f_ref.var [concrete = %f_ref.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %f_ref.patt: %pattern_type.1c1 = ref_binding_pattern f_ref [concrete = constants.%f_ref.patt]
// CHECK:STDOUT: %f_ref.var_patt: %pattern_type.1c1 = var_pattern %f_ref.patt [concrete = constants.%f_ref.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Empty {
// CHECK:STDOUT: %Self: %Empty.type = symbolic_binding Self, 0 [symbolic = constants.%Self.d44]
// CHECK:STDOUT: %Empty.WithSelf.decl = interface_with_self_decl @Empty [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Basic {
// CHECK:STDOUT: %Self: %Basic.type = symbolic_binding Self, 0 [symbolic = constants.%Self.89c]
// CHECK:STDOUT: %Basic.WithSelf.decl = interface_with_self_decl @Basic [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %T: type = assoc_const_decl @T.loc8 [concrete] {
// CHECK:STDOUT: %assoc0: %Basic.assoc_type = assoc_entity element0, @Basic.WithSelf.%T [concrete = constants.%assoc0.05f]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Basic.WithSelf.F.decl: @Basic.WithSelf.%Basic.WithSelf.F.type (%Basic.WithSelf.F.type) = fn_decl @Basic.WithSelf.F [symbolic = @Basic.WithSelf.%Basic.WithSelf.F (constants.%Basic.WithSelf.F)] {} {}
// CHECK:STDOUT: %assoc1: %Basic.assoc_type = assoc_entity element1, %Basic.WithSelf.F.decl [concrete = constants.%assoc1.de2]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .T = @T.loc8.%assoc0
// CHECK:STDOUT: .F = @Basic.WithSelf.%assoc1
// CHECK:STDOUT: witness = (@Basic.WithSelf.%T, @Basic.WithSelf.%Basic.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @ForwardDeclared {
// CHECK:STDOUT: %Self: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic = constants.%Self.d56]
// CHECK:STDOUT: %ForwardDeclared.WithSelf.decl = interface_with_self_decl @ForwardDeclared [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %T: type = assoc_const_decl @T.loc16 [concrete] {
// CHECK:STDOUT: %assoc0: %ForwardDeclared.assoc_type = assoc_entity element0, @ForwardDeclared.WithSelf.%T [concrete = constants.%assoc0.10f]
// CHECK:STDOUT: }
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.decl: @ForwardDeclared.WithSelf.%ForwardDeclared.WithSelf.F.type (%ForwardDeclared.WithSelf.F.type) = fn_decl @ForwardDeclared.WithSelf.F [symbolic = @ForwardDeclared.WithSelf.%ForwardDeclared.WithSelf.F (constants.%ForwardDeclared.WithSelf.F)] {} {}
// CHECK:STDOUT: %assoc1: %ForwardDeclared.assoc_type = assoc_entity element1, %ForwardDeclared.WithSelf.F.decl [concrete = constants.%assoc1.18a]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .T = @T.loc16.%assoc0
// CHECK:STDOUT: .F = @ForwardDeclared.WithSelf.%assoc1
// CHECK:STDOUT: witness = (@ForwardDeclared.WithSelf.%T, @ForwardDeclared.WithSelf.%ForwardDeclared.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Basic.WithSelf.F(@Basic.%Self: %Basic.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @ForwardDeclared.WithSelf.F(@ForwardDeclared.%Self: %ForwardDeclared.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%struct_type.f, (constants.%DefaultOrUnformed.impl_witness.c8a) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc20_33.1: %DefaultOrUnformed.type = converted constants.%struct_type.f, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc20_33.1 [concrete = constants.%struct_type.f]
// CHECK:STDOUT: %.loc20_33.2: type = converted %.loc20_33.1, %as_type [concrete = constants.%struct_type.f]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.DefaultOrUnformed.impl.Op.11c, @T.as.DefaultOrUnformed.impl.Op(constants.%struct_type.f) [concrete = constants.%T.as.DefaultOrUnformed.impl.Op.specific_fn]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %struct_type.f = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign file.%f_ref.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Empty.WithSelf(constants.%Self.d44) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Basic.WithSelf(constants.%Self.89c) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Basic.WithSelf.F(constants.%Self.89c) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclared.WithSelf(constants.%Self.d56) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self.d56
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.type => constants.%ForwardDeclared.WithSelf.F.type
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F => constants.%ForwardDeclared.WithSelf.F
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclared.WithSelf.F(constants.%Self.d56) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Empty.type: type = facet_type <@Empty> [concrete]
// CHECK:STDOUT: %Self.4e8: %Empty.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.894: type = pattern_type %Empty.type [concrete]
// CHECK:STDOUT: %e.param_patt.a16: %pattern_type.894 = value_param_pattern [concrete]
// CHECK:STDOUT: %e.patt.639: %pattern_type.894 = wrapper_binding_pattern e, %e.param_patt.a16 [concrete]
// CHECK:STDOUT: %UseEmpty.type: type = fn_type @UseEmpty [concrete]
// CHECK:STDOUT: %UseEmpty: %UseEmpty.type = struct_value () [concrete]
// CHECK:STDOUT: %Basic.type: type = facet_type <@Basic> [concrete]
// CHECK:STDOUT: %Self.a33: %Basic.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Basic.WithSelf.F.type: type = fn_type @Basic.WithSelf.F, @Basic.WithSelf(%Self.a33) [symbolic]
// CHECK:STDOUT: %Basic.WithSelf.F: %Basic.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %pattern_type.7fe: type = pattern_type %Basic.type [concrete]
// CHECK:STDOUT: %e.param_patt.7a3: %pattern_type.7fe = value_param_pattern [concrete]
// CHECK:STDOUT: %e.patt.8fd: %pattern_type.7fe = wrapper_binding_pattern e, %e.param_patt.7a3 [concrete]
// CHECK:STDOUT: %UseBasic.type: type = fn_type @UseBasic [concrete]
// CHECK:STDOUT: %UseBasic: %UseBasic.type = struct_value () [concrete]
// CHECK:STDOUT: %ForwardDeclared.type: type = facet_type <@ForwardDeclared> [concrete]
// CHECK:STDOUT: %Self.603: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.type: type = fn_type @ForwardDeclared.WithSelf.F, @ForwardDeclared.WithSelf(%Self.603) [symbolic]
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F: %ForwardDeclared.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %pattern_type.566: type = pattern_type %ForwardDeclared.type [concrete]
// CHECK:STDOUT: %f.param_patt: %pattern_type.566 = value_param_pattern [concrete]
// CHECK:STDOUT: %f.patt.6f0: %pattern_type.566 = wrapper_binding_pattern f, %f.param_patt [concrete]
// CHECK:STDOUT: %UseForwardDeclared.type: type = fn_type @UseForwardDeclared [concrete]
// CHECK:STDOUT: %UseForwardDeclared: %UseForwardDeclared.type = struct_value () [concrete]
// CHECK:STDOUT: %Basic.assoc_type: type = assoc_entity_type @Basic [concrete]
// CHECK:STDOUT: %assoc0.2b3: %Basic.assoc_type = assoc_entity element0, imports.%Main.import_ref.98e [concrete]
// CHECK:STDOUT: %assoc1.453: %Basic.assoc_type = assoc_entity element1, imports.%Main.import_ref.442 [concrete]
// CHECK:STDOUT: %ForwardDeclared.assoc_type: type = assoc_entity_type @ForwardDeclared [concrete]
// CHECK:STDOUT: %assoc0.096: %ForwardDeclared.assoc_type = assoc_entity element0, imports.%Main.import_ref.643 [concrete]
// CHECK:STDOUT: %assoc1.bea: %ForwardDeclared.assoc_type = assoc_entity element1, imports.%Main.import_ref.1d3 [concrete]
// CHECK:STDOUT: %ptr.b71: type = ptr_type %ForwardDeclared.type [concrete]
// CHECK:STDOUT: %pattern_type.7a7: type = pattern_type %ptr.b71 [concrete]
// CHECK:STDOUT: %f.patt.752: %pattern_type.7a7 = ref_binding_pattern f [concrete]
// CHECK:STDOUT: %f.var_patt: %pattern_type.7a7 = var_pattern %f.patt.752 [concrete]
// CHECK:STDOUT: %struct_type.f: type = struct_type {.f: %ForwardDeclared.type} [concrete]
// CHECK:STDOUT: %pattern_type.1c1: type = pattern_type %struct_type.f [concrete]
// CHECK:STDOUT: %f_ref.patt: %pattern_type.1c1 = ref_binding_pattern f_ref [concrete]
// CHECK:STDOUT: %f_ref.var_patt: %pattern_type.1c1 = var_pattern %f_ref.patt [concrete]
// CHECK:STDOUT: %.594: ref %ForwardDeclared.type = struct_access imports.%f_ref.var, element0 [concrete]
// CHECK:STDOUT: %addr: %ptr.b71 = addr_of %.594 [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.20f: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.f12: %ptr.as.Copy.impl.Op.type.20f = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.2cb: <witness> = impl_witness imports.%Copy.impl_witness_table.fb0, @ptr.as.Copy.impl(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.a6d: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.f22: %ptr.as.Copy.impl.Op.type.a6d = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %ptr.b71, (%Copy.impl_witness.2cb) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.b85: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.e1b: type = fn_type_with_self_type %Copy.WithSelf.Op.type.b85, %Copy.facet [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.bound: <bound method> = bound_method %addr, %ptr.as.Copy.impl.Op.f22 [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.f22, @ptr.as.Copy.impl.Op(%ForwardDeclared.type) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %addr, %ptr.as.Copy.impl.Op.specific_fn [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.Empty: type = import_ref Main//a, Empty, loaded [concrete = constants.%Empty.type]
// CHECK:STDOUT: %Main.Basic: type = import_ref Main//a, Basic, loaded [concrete = constants.%Basic.type]
// CHECK:STDOUT: %Main.ForwardDeclared: type = import_ref Main//a, ForwardDeclared, loaded [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %Main.f_ref: ref %struct_type.f = import_ref Main//a, f_ref, loaded [concrete = %f_ref.var]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Copy = %Core.Copy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.852 = import_ref Main//a, loc4_17, unloaded
// CHECK:STDOUT: %Main.import_ref.5b8: %Basic.assoc_type = import_ref Main//a, loc8_8, loaded [concrete = constants.%assoc0.2b3]
// CHECK:STDOUT: %Main.import_ref.864: %Basic.assoc_type = import_ref Main//a, loc9_9, loaded [concrete = constants.%assoc1.453]
// CHECK:STDOUT: %Main.T.e1d = import_ref Main//a, T, unloaded
// CHECK:STDOUT: %Main.F.153 = import_ref Main//a, F, unloaded
// CHECK:STDOUT: %Main.import_ref.316a0d.2: %Basic.type = import_ref Main//a, loc7_17, loaded [symbolic = constants.%Self.a33]
// CHECK:STDOUT: %Main.import_ref.eb6 = import_ref Main//a, loc7_17, unloaded
// CHECK:STDOUT: %Main.import_ref.825: %ForwardDeclared.assoc_type = import_ref Main//a, loc16_8, loaded [concrete = constants.%assoc0.096]
// CHECK:STDOUT: %Main.import_ref.e7e: %ForwardDeclared.assoc_type = import_ref Main//a, loc17_9, loaded [concrete = constants.%assoc1.bea]
// CHECK:STDOUT: %Main.T.c9b = import_ref Main//a, T, unloaded
// CHECK:STDOUT: %Main.F.05d = import_ref Main//a, F, unloaded
// CHECK:STDOUT: %Main.import_ref.a75fa2.2: %ForwardDeclared.type = import_ref Main//a, loc15_27, loaded [symbolic = constants.%Self.603]
// CHECK:STDOUT: %Main.import_ref.ef5 = import_ref Main//a, loc15_27, unloaded
// CHECK:STDOUT: %Main.import_ref.98e = import_ref Main//a, loc8_8, unloaded
// CHECK:STDOUT: %Main.import_ref.442 = import_ref Main//a, loc9_9, unloaded
// CHECK:STDOUT: %Main.import_ref.643 = import_ref Main//a, loc16_8, unloaded
// CHECK:STDOUT: %Main.import_ref.1d3 = import_ref Main//a, loc17_9, unloaded
// CHECK:STDOUT: %f_ref.var: ref %struct_type.f = var_storage constants.%f_ref.var_patt [concrete]
// CHECK:STDOUT: %Core.Copy: type = import_ref Core//prelude/parts/copy, Copy, loaded [concrete = constants.%Copy.type]
// CHECK:STDOUT: %Core.import_ref.06a: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.20f) = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [symbolic = @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op (constants.%ptr.as.Copy.impl.Op.f12)]
// CHECK:STDOUT: %Copy.impl_witness_table.fb0 = impl_witness_table (%Core.import_ref.06a), @ptr.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Empty = imports.%Main.Empty
// CHECK:STDOUT: .Basic = imports.%Main.Basic
// CHECK:STDOUT: .ForwardDeclared = imports.%Main.ForwardDeclared
// CHECK:STDOUT: .f_ref = imports.%Main.f_ref
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .UseEmpty = %UseEmpty.decl
// CHECK:STDOUT: .UseBasic = %UseBasic.decl
// CHECK:STDOUT: .UseForwardDeclared = %UseForwardDeclared.decl
// CHECK:STDOUT: .UseBasicT = %UseBasicT
// CHECK:STDOUT: .UseBasicF = %UseBasicF
// CHECK:STDOUT: .UseForwardDeclaredT = %UseForwardDeclaredT
// CHECK:STDOUT: .UseForwardDeclaredF = %UseForwardDeclaredF
// CHECK:STDOUT: .f = %f
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %UseEmpty.decl: %UseEmpty.type = fn_decl @UseEmpty [concrete = constants.%UseEmpty] {
// CHECK:STDOUT: %e.param_patt: %pattern_type.894 = value_param_pattern [concrete = constants.%e.param_patt.a16]
// CHECK:STDOUT: %e.patt: %pattern_type.894 = wrapper_binding_pattern e, %e.param_patt [concrete = constants.%e.patt.639]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %e.param: %Empty.type = value_param call_param0
// CHECK:STDOUT: %Empty.ref: type = name_ref Empty, imports.%Main.Empty [concrete = constants.%Empty.type]
// CHECK:STDOUT: %e: %Empty.type = wrapper_binding e, %e.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %UseBasic.decl: %UseBasic.type = fn_decl @UseBasic [concrete = constants.%UseBasic] {
// CHECK:STDOUT: %e.param_patt: %pattern_type.7fe = value_param_pattern [concrete = constants.%e.param_patt.7a3]
// CHECK:STDOUT: %e.patt: %pattern_type.7fe = wrapper_binding_pattern e, %e.param_patt [concrete = constants.%e.patt.8fd]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %e.param: %Basic.type = value_param call_param0
// CHECK:STDOUT: %Basic.ref: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT: %e: %Basic.type = wrapper_binding e, %e.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %UseForwardDeclared.decl: %UseForwardDeclared.type = fn_decl @UseForwardDeclared [concrete = constants.%UseForwardDeclared] {
// CHECK:STDOUT: %f.param_patt: %pattern_type.566 = value_param_pattern [concrete = constants.%f.param_patt]
// CHECK:STDOUT: %f.patt: %pattern_type.566 = wrapper_binding_pattern f, %f.param_patt [concrete = constants.%f.patt.6f0]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %f.param: %ForwardDeclared.type = value_param call_param0
// CHECK:STDOUT: %ForwardDeclared.ref: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %f: %ForwardDeclared.type = wrapper_binding f, %f.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Basic.ref.loc10: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT: %T.ref.loc10: %Basic.assoc_type = name_ref T, imports.%Main.import_ref.5b8 [concrete = constants.%assoc0.2b3]
// CHECK:STDOUT: %UseBasicT: %Basic.assoc_type = alias_binding UseBasicT, %T.ref.loc10 [concrete = constants.%assoc0.2b3]
// CHECK:STDOUT: %Basic.ref.loc11: type = name_ref Basic, imports.%Main.Basic [concrete = constants.%Basic.type]
// CHECK:STDOUT: %F.ref.loc11: %Basic.assoc_type = name_ref F, imports.%Main.import_ref.864 [concrete = constants.%assoc1.453]
// CHECK:STDOUT: %UseBasicF: %Basic.assoc_type = alias_binding UseBasicF, %F.ref.loc11 [concrete = constants.%assoc1.453]
// CHECK:STDOUT: %ForwardDeclared.ref.loc13: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %T.ref.loc13: %ForwardDeclared.assoc_type = name_ref T, imports.%Main.import_ref.825 [concrete = constants.%assoc0.096]
// CHECK:STDOUT: %UseForwardDeclaredT: %ForwardDeclared.assoc_type = alias_binding UseForwardDeclaredT, %T.ref.loc13 [concrete = constants.%assoc0.096]
// CHECK:STDOUT: %ForwardDeclared.ref.loc14: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %F.ref.loc14: %ForwardDeclared.assoc_type = name_ref F, imports.%Main.import_ref.e7e [concrete = constants.%assoc1.bea]
// CHECK:STDOUT: %UseForwardDeclaredF: %ForwardDeclared.assoc_type = alias_binding UseForwardDeclaredF, %F.ref.loc14 [concrete = constants.%assoc1.bea]
// CHECK:STDOUT: %f.var: ref %ptr.b71 = var_storage %f.var_patt [concrete]
// CHECK:STDOUT: %.loc16: type = splice_block %ptr [concrete = constants.%ptr.b71] {
// CHECK:STDOUT: %ForwardDeclared.ref.loc16: type = name_ref ForwardDeclared, imports.%Main.ForwardDeclared [concrete = constants.%ForwardDeclared.type]
// CHECK:STDOUT: %ptr: type = ptr_type %ForwardDeclared.ref.loc16 [concrete = constants.%ptr.b71]
// CHECK:STDOUT: }
// CHECK:STDOUT: %f: ref %ptr.b71 = wrapper_binding f, %f.var [concrete = %f.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %f.patt: %pattern_type.7a7 = ref_binding_pattern f [concrete = constants.%f.patt.752]
// CHECK:STDOUT: %f.var_patt: %pattern_type.7a7 = var_pattern %f.patt [concrete = constants.%f.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Empty [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.852
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Basic [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.eb6
// CHECK:STDOUT: .T = imports.%Main.import_ref.5b8
// CHECK:STDOUT: .F = imports.%Main.import_ref.864
// CHECK:STDOUT: witness = (imports.%Main.T.e1d, imports.%Main.F.153)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @ForwardDeclared [from "a.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.ef5
// CHECK:STDOUT: .T = imports.%Main.import_ref.825
// CHECK:STDOUT: .F = imports.%Main.import_ref.e7e
// CHECK:STDOUT: witness = (imports.%Main.T.c9b, imports.%Main.F.05d)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseEmpty(%e.param: %Empty.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Basic.WithSelf.F(imports.%Main.import_ref.316a0d.2: %Basic.type) [from "a.carbon"] {
// CHECK:STDOUT: fn;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseBasic(%e.param: %Basic.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @ForwardDeclared.WithSelf.F(imports.%Main.import_ref.a75fa2.2: %ForwardDeclared.type) [from "a.carbon"] {
// CHECK:STDOUT: fn;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @UseForwardDeclared(%f.param: %ForwardDeclared.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %f_ref.ref: ref %struct_type.f = name_ref f_ref, imports.%Main.f_ref [concrete = imports.%f_ref.var]
// CHECK:STDOUT: %.loc16: ref %ForwardDeclared.type = struct_access %f_ref.ref, element0 [concrete = constants.%.594]
// CHECK:STDOUT: %addr: %ptr.b71 = addr_of %.loc16 [concrete = constants.%addr]
// CHECK:STDOUT: %impl.elem0: %.e1b = impl_witness_access constants.%Copy.impl_witness.2cb, element0 [concrete = constants.%ptr.as.Copy.impl.Op.f22]
// CHECK:STDOUT: %bound_method.loc16_27.1: <bound method> = bound_method %addr, %impl.elem0 [concrete = constants.%ptr.as.Copy.impl.Op.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @ptr.as.Copy.impl.Op(constants.%ForwardDeclared.type) [concrete = constants.%ptr.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc16_27.2: <bound method> = bound_method %addr, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.call: init %ptr.b71 = call %bound_method.loc16_27.2(%addr) [concrete = constants.%addr]
// CHECK:STDOUT: assign file.%f.var, %ptr.as.Copy.impl.Op.call
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Empty.WithSelf(constants.%Self.4e8) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Basic.WithSelf(constants.%Self.a33) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self.a33
// CHECK:STDOUT: %Basic.WithSelf.F.type => constants.%Basic.WithSelf.F.type
// CHECK:STDOUT: %Basic.WithSelf.F => constants.%Basic.WithSelf.F
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Basic.WithSelf.F(constants.%Self.a33) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclared.WithSelf(constants.%Self.603) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self.603
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.type => constants.%ForwardDeclared.WithSelf.F.type
// CHECK:STDOUT: %ForwardDeclared.WithSelf.F => constants.%ForwardDeclared.WithSelf.F
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclared.WithSelf.F(constants.%Self.603) {}
// CHECK:STDOUT:
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