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carbon-lang/toolchain/check/testdata/class/implicit_import.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/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/class/implicit_import.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/implicit_import.carbon
// --- basic.carbon
library "[[@TEST_NAME]]";
class C;
// --- basic.impl.carbon
impl library "[[@TEST_NAME]]";
class C {}
// --- redecl_after_def.carbon
library "[[@TEST_NAME]]";
class C {}
// --- fail_redecl_after_def.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE+8]]:1: error: redeclaration of `class C` is redundant [RedeclRedundant]
// CHECK:STDERR: class C;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE-5]]:1: in import [InImport]
// CHECK:STDERR: redecl_after_def.carbon:4:1: note: previously declared here [RedeclPrevDecl]
// CHECK:STDERR: class C {}
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
class C;
// --- redef_after_def.carbon
library "[[@TEST_NAME]]";
class C {}
// --- fail_redef_after_def.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE+8]]:1: error: redefinition of `class C` [RedeclRedef]
// CHECK:STDERR: class C {}
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE-5]]:1: in import [InImport]
// CHECK:STDERR: redef_after_def.carbon:4:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: class C {}
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
class C {}
// --- def_alias.carbon
library "[[@TEST_NAME]]";
class C;
alias B = C;
// --- fail_def_alias.impl.carbon
impl library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE+8]]:7: error: duplicate name `B` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: class B {}
// CHECK:STDERR: ^
// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE-5]]:1: in import [InImport]
// CHECK:STDERR: def_alias.carbon:5:7: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: alias B = C;
// CHECK:STDERR: ^
// CHECK:STDERR:
class B {}
// CHECK:STDOUT: --- basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C;
// CHECK:STDOUT:
// CHECK:STDOUT: --- basic.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import.loc2_21.1 = import <none>
// CHECK:STDOUT: %default.import.loc2_21.2 = import <none>
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// 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: --- redecl_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// 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: --- fail_redecl_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.import_ref.8f2: <witness> = import_ref Main//redecl_after_def, loc4_10, loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.439 = import_ref Main//redecl_after_def, inst{{[0-9A-F]+}} [no loc], unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import.loc2_32.1 = import <none>
// CHECK:STDOUT: %default.import.loc2_32.2 = import <none>
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.439
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- redef_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// 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: --- fail_redef_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C.921ae1.1: type = class_type @C.1 [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %C.921ae1.2: type = class_type @C.loc12 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.C: type = import_ref Main//redef_after_def, C, loaded [concrete = constants.%C.921ae1.1]
// CHECK:STDOUT: %Main.import_ref.8f2: <witness> = import_ref Main//redef_after_def, loc4_10, loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.c9b = import_ref Main//redef_after_def, inst{{[0-9A-F]+}} [no loc], unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = imports.%Main.C
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import.loc2_31.1 = import <none>
// CHECK:STDOUT: %default.import.loc2_31.2 = import <none>
// CHECK:STDOUT: %C.decl: type = class_decl @C.loc12 [concrete = constants.%C.921ae1.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C.1 [from "redef_after_def.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.c9b
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C.loc12 {
// 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.921ae1.2
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- def_alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .B = %B
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %B: type = alias_binding B, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_def_alias.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %B: type = class_type @B [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.C = import_ref Main//def_alias, C, unloaded
// CHECK:STDOUT: %Main.B: type = import_ref Main//def_alias, B, loaded [concrete = constants.%C]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = imports.%Main.C
// CHECK:STDOUT: .B = imports.%Main.B
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import.loc2_25.1 = import <none>
// CHECK:STDOUT: %default.import.loc2_25.2 = import <none>
// CHECK:STDOUT: %B.decl: type = class_decl @B [concrete = constants.%B] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C [from "def_alias.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: class @B {
// 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.%B
// CHECK:STDOUT: }
// CHECK:STDOUT:
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