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carbon-lang/toolchain/check/testdata/impl/fail_alias.carbon
T
Richard Smith 05cc09daca Fix cross-package signature mismatches. (#7232)
Fixes link failures when referencing a symbol involving a fingerprint
from a different package.

Previously we included the `Namespace`'s `import_id` as part of its
fingerprint, which caused local and imported namespaces to get different
fingerprints. We now store the `import_id` on the `NameScope` instead of
on the `Namespace` inst to avoid this problem.

Also, when we reach a package-level `NameScopeId`, consistently
fingerprint it as a (package name, library name) pair. Previously the
fingerprinting depended on whether it was imported or not, as an
imported `NameScopeId` had a parent scope (the current package). We need
to include the library name here so that private entities with the same
name in different libraries have different fingerprints.
2026-05-21 00:02:29 +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/none.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/impl/fail_alias.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/fail_alias.carbon
interface I {}
class C {}
alias AI = I;
alias AC = C;
impl AC as AI {}
// CHECK:STDERR: fail_alias.carbon:[[@LINE+7]]:1: error: redefinition of `impl AC as AI` [ImplRedefinition]
// CHECK:STDERR: impl AC as AI {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_alias.carbon:[[@LINE-5]]:1: note: previous definition was here [ImplPreviousDefinition]
// CHECK:STDERR: impl AC as AI {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR:
impl AC as AI {}
// CHECK:STDOUT: --- fail_alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [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: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.87eede.1.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .AI = %AI
// CHECK:STDOUT: .AC = %AC
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %I.ref: type = name_ref I, %I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: %AI: type = alias_binding AI, %I.ref [concrete = constants.%I.type]
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %AC: type = alias_binding AC, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: impl_decl @C.as.I.impl.87eede.1 [concrete] {} {
// CHECK:STDOUT: %AC.ref: type = name_ref AC, file.%AC [concrete = constants.%C]
// CHECK:STDOUT: %AI.ref: type = name_ref AI, file.%AI [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: impl_decl @C.as.I.impl.87eede.2 [concrete] {} {
// CHECK:STDOUT: %AC.ref: type = name_ref AC, file.%AC [concrete = constants.%C]
// CHECK:STDOUT: %AI.ref: type = name_ref AI, file.%AI [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %I.WithSelf.decl = interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl.87eede.1: %AC.ref as %AI.ref {
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (), @C.as.I.impl.87eede.1 [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %AI.ref
// CHECK:STDOUT: witness = %I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl.87eede.2: %AC.ref as %AI.ref {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %AI.ref
// CHECK:STDOUT: witness = <error>
// 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: specific @I.WithSelf(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%I.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT: