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carbon-lang/toolchain/check/testdata/let/fail_duplicate_decl.carbon
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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/int.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/let/fail_duplicate_decl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/let/fail_duplicate_decl.carbon
fn F() {
let unused a: i32 = 1;
// CHECK:STDERR: fail_duplicate_decl.carbon:[[@LINE+7]]:14: error: duplicate name `a` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: let unused a: i32 = 2;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_decl.carbon:[[@LINE-4]]:14: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: let unused a: i32 = 1;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
let unused a: i32 = 2;
}
// CHECK:STDOUT: --- fail_duplicate_decl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.c6b: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %ImplicitAs.type.649: type = generic_interface_type @ImplicitAs [concrete]
// CHECK:STDOUT: %ImplicitAs.generic: %ImplicitAs.type.649 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.type.544: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.766: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.ec3: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.766 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.fb6: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.1a5, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.ef7: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.ef7 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.544 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.fb6) [concrete]
// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.367: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%i32, %ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %.205: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.367, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.c0d: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method.33d: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.d5e: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.22e: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b [concrete]
// CHECK:STDOUT: %bound_method.cc3: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.4ff: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.ImplicitAs: %ImplicitAs.type.649 = import_ref Core//prelude/parts/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
// CHECK:STDOUT: %Core.import_ref.dd3: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.766) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.ec3)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.1a5 = impl_witness_table (%Core.import_ref.dd3), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt.loc16: %pattern_type.c6b = value_binding_pattern a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %i32.loc16: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc16: %.205 = impl_witness_access constants.%ImplicitAs.impl_witness.fb6, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b]
// CHECK:STDOUT: %bound_method.loc16_23.1: <bound method> = bound_method %int_1, %impl.elem0.loc16 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.c0d]
// CHECK:STDOUT: %specific_fn.loc16: <specific function> = specific_function %impl.elem0.loc16, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc16_23.2: <bound method> = bound_method %int_1, %specific_fn.loc16 [concrete = constants.%bound_method.33d]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc16: init %i32 = call %bound_method.loc16_23.2(%int_1) [concrete = constants.%int_1.d5e]
// CHECK:STDOUT: %.loc16_23.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc16 [concrete = constants.%int_1.d5e]
// CHECK:STDOUT: %.loc16_23.2: %i32 = converted %int_1, %.loc16_23.1 [concrete = constants.%int_1.d5e]
// CHECK:STDOUT: %a.loc16: %i32 = value_binding a, %.loc16_23.2
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt.loc24: %pattern_type.c6b = value_binding_pattern a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %i32.loc24: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc24: %.205 = impl_witness_access constants.%ImplicitAs.impl_witness.fb6, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.e6b]
// CHECK:STDOUT: %bound_method.loc24_23.1: <bound method> = bound_method %int_2, %impl.elem0.loc24 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.22e]
// CHECK:STDOUT: %specific_fn.loc24: <specific function> = specific_function %impl.elem0.loc24, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc24_23.2: <bound method> = bound_method %int_2, %specific_fn.loc24 [concrete = constants.%bound_method.cc3]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc24: init %i32 = call %bound_method.loc24_23.2(%int_2) [concrete = constants.%int_2.4ff]
// CHECK:STDOUT: %.loc24_23.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc24 [concrete = constants.%int_2.4ff]
// CHECK:STDOUT: %.loc24_23.2: %i32 = converted %int_2, %.loc24_23.1 [concrete = constants.%int_2.4ff]
// CHECK:STDOUT: %a.loc24: %i32 = value_binding a, %.loc24_23.2
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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