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carbon-lang/toolchain/check/testdata/named_constraint/generic.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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/named_constraint/generic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/named_constraint/generic.carbon
// --- generic.carbon
library "[[@TEST_NAME]]";
//@include-in-dumps
constraint GenericType(T:! type) {}
interface Z {}
constraint GenericZ(U:! Z) {}
constraint ForwardDeclaredGeneric(T:! type);
constraint ForwardDeclaredGeneric(T:! type) {}
// --- fail_mismatched_generic_param_types.carbon
library "[[@TEST_NAME]]";
constraint ForwardDeclaredGeneric(T:! ());
// CHECK:STDERR: fail_mismatched_generic_param_types.carbon:[[@LINE+7]]:35: error: type `<pattern for type>` of parameter 1 in redeclaration differs from previous parameter type `<pattern for ()>` [RedeclParamDiffersType]
// CHECK:STDERR: constraint ForwardDeclaredGeneric(T:! type) {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_mismatched_generic_param_types.carbon:[[@LINE-4]]:35: note: previous declaration's corresponding parameter here [RedeclParamPrevious]
// CHECK:STDERR: constraint ForwardDeclaredGeneric(T:! ());
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
constraint ForwardDeclaredGeneric(T:! type) {}
// --- fail_mismatched_generic_param_arity.carbon
library "[[@TEST_NAME]]";
constraint ForwardDeclaredGeneric(T:! type, U:! type);
// CHECK:STDERR: fail_mismatched_generic_param_arity.carbon:[[@LINE+7]]:1: error: redeclaration differs because of parameter count of 1 [RedeclParamCountDiffers]
// CHECK:STDERR: constraint ForwardDeclaredGeneric(T:! type) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_mismatched_generic_param_arity.carbon:[[@LINE-4]]:1: note: previously declared with parameter count of 2 [RedeclParamCountPrevious]
// CHECK:STDERR: constraint ForwardDeclaredGeneric(T:! type, U:! type);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
constraint ForwardDeclaredGeneric(T:! type) {}
// --- fail_inside_definition.carbon
library "[[@TEST_NAME]]";
constraint Generic(T:! type) {}
// CHECK:STDERR: fail_inside_definition.carbon:[[@LINE+7]]:1: error: redefinition of `constraint Generic` [RedeclRedef]
// CHECK:STDERR: constraint Generic(T:! type) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_inside_definition.carbon:[[@LINE-4]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: constraint Generic(T:! type) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
constraint Generic(T:! type) {}
// --- fail_args_count_mismatch.carbon
library "[[@TEST_NAME]]";
constraint Generic(T:! type) {}
// CHECK:STDERR: fail_args_count_mismatch.carbon:[[@LINE+7]]:17: error: 2 arguments passed to generic constraint expecting 1 argument [CallArgCountMismatch]
// CHECK:STDERR: fn F(unused T:! Generic((), ())) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_args_count_mismatch.carbon:[[@LINE-5]]:1: note: calling generic constraint declared here [InCallToEntity]
// CHECK:STDERR: constraint Generic(T:! type) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(unused T:! Generic((), ())) {}
// CHECK:STDOUT: --- generic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %GenericType.type.686: type = generic_named_constaint_type @GenericType [concrete]
// CHECK:STDOUT: %empty_struct.91c: %GenericType.type.686 = struct_value () [concrete]
// CHECK:STDOUT: %GenericType.type.d68: type = facet_type <@GenericType, @GenericType(%T)> [symbolic]
// CHECK:STDOUT: %Self.301448.1: %GenericType.type.d68 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %Self.86a: %Z.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.1e5: type = pattern_type %Z.type [concrete]
// CHECK:STDOUT: %U: %Z.type = symbolic_binding U, 0 [symbolic]
// CHECK:STDOUT: %GenericZ.type.d06: type = generic_named_constaint_type @GenericZ [concrete]
// CHECK:STDOUT: %empty_struct.4ea: %GenericZ.type.d06 = struct_value () [concrete]
// CHECK:STDOUT: %GenericZ.type.d68: type = facet_type <@GenericZ, @GenericZ(%U)> [symbolic]
// CHECK:STDOUT: %Self.301448.2: %GenericZ.type.d68 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: %ForwardDeclaredGeneric.type.f6f: type = generic_named_constaint_type @ForwardDeclaredGeneric [concrete]
// CHECK:STDOUT: %empty_struct.06e: %ForwardDeclaredGeneric.type.f6f = struct_value () [concrete]
// CHECK:STDOUT: %ForwardDeclaredGeneric.type.d68: type = facet_type <@ForwardDeclaredGeneric, @ForwardDeclaredGeneric(%T)> [symbolic]
// CHECK:STDOUT: %Self.301448.3: %ForwardDeclaredGeneric.type.d68 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .GenericType = %GenericType.decl
// CHECK:STDOUT: .Z = %Z.decl
// CHECK:STDOUT: .GenericZ = %GenericZ.decl
// CHECK:STDOUT: .ForwardDeclaredGeneric = %ForwardDeclaredGeneric.decl.loc9
// CHECK:STDOUT: }
// CHECK:STDOUT: %GenericType.decl: %GenericType.type.686 = constraint_decl @GenericType [concrete = constants.%empty_struct.91c] {
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc4_28.1: type = splice_block %.loc4_28.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc4_28.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc4_25.2: type = symbolic_binding T, 0 [symbolic = %T.loc4_25.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Z.decl: type = interface_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: %GenericZ.decl: %GenericZ.type.d06 = constraint_decl @GenericZ [concrete = constants.%empty_struct.4ea] {
// CHECK:STDOUT: %U.patt: %pattern_type.1e5 = symbolic_binding_pattern U, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc7: type = splice_block %Z.ref [concrete = constants.%Z.type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %Z.ref: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %U.loc7_22.2: %Z.type = symbolic_binding U, 0 [symbolic = %U.loc7_22.1 (constants.%U)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %ForwardDeclaredGeneric.decl.loc9: %ForwardDeclaredGeneric.type.f6f = constraint_decl @ForwardDeclaredGeneric [concrete = constants.%empty_struct.06e] {
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc9_39.1: type = splice_block %.loc9_39.2 [concrete = type] {
// CHECK:STDOUT: %.Self.loc9: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc9_39.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc9_36.2: type = symbolic_binding T, 0 [symbolic = %T.loc9_36.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %ForwardDeclaredGeneric.decl.loc10: %ForwardDeclaredGeneric.type.f6f = constraint_decl @ForwardDeclaredGeneric [concrete = constants.%empty_struct.06e] {
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc10_39.1: type = splice_block %.loc10_39.2 [concrete = type] {
// CHECK:STDOUT: %.Self.loc10: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc10_39.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc10: type = symbolic_binding T, 0 [symbolic = %T.loc9_36.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Z {
// CHECK:STDOUT: %Self: %Z.type = symbolic_binding Self, 0 [symbolic = constants.%Self.86a]
// CHECK:STDOUT: %Z.WithSelf.decl = interface_with_self_decl @Z [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 constraint @GenericType(%T.loc4_25.2: type) {
// CHECK:STDOUT: %T.loc4_25.1: type = symbolic_binding T, 0 [symbolic = %T.loc4_25.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %GenericType.type: type = facet_type <@GenericType, @GenericType(%T.loc4_25.1)> [symbolic = %GenericType.type (constants.%GenericType.type.d68)]
// CHECK:STDOUT: %Self.loc4_34.2: @GenericType.%GenericType.type (%GenericType.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc4_34.2 (constants.%Self.301448.1)]
// CHECK:STDOUT:
// CHECK:STDOUT: constraint {
// CHECK:STDOUT: %Self.loc4_34.1: @GenericType.%GenericType.type (%GenericType.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc4_34.2 (constants.%Self.301448.1)]
// CHECK:STDOUT: %GenericType.WithSelf.decl = constraint_with_self_decl @GenericType [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc4_34.1
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic constraint @GenericZ(%U.loc7_22.2: %Z.type) {
// CHECK:STDOUT: %U.loc7_22.1: %Z.type = symbolic_binding U, 0 [symbolic = %U.loc7_22.1 (constants.%U)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %GenericZ.type: type = facet_type <@GenericZ, @GenericZ(%U.loc7_22.1)> [symbolic = %GenericZ.type (constants.%GenericZ.type.d68)]
// CHECK:STDOUT: %Self.loc7_28.2: @GenericZ.%GenericZ.type (%GenericZ.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc7_28.2 (constants.%Self.301448.2)]
// CHECK:STDOUT:
// CHECK:STDOUT: constraint {
// CHECK:STDOUT: %Self.loc7_28.1: @GenericZ.%GenericZ.type (%GenericZ.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc7_28.2 (constants.%Self.301448.2)]
// CHECK:STDOUT: %GenericZ.WithSelf.decl = constraint_with_self_decl @GenericZ [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc7_28.1
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic constraint @ForwardDeclaredGeneric(%T.loc9_36.2: type) {
// CHECK:STDOUT: %T.loc9_36.1: type = symbolic_binding T, 0 [symbolic = %T.loc9_36.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %ForwardDeclaredGeneric.type: type = facet_type <@ForwardDeclaredGeneric, @ForwardDeclaredGeneric(%T.loc9_36.1)> [symbolic = %ForwardDeclaredGeneric.type (constants.%ForwardDeclaredGeneric.type.d68)]
// CHECK:STDOUT: %Self.loc10_45.2: @ForwardDeclaredGeneric.%ForwardDeclaredGeneric.type (%ForwardDeclaredGeneric.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc10_45.2 (constants.%Self.301448.3)]
// CHECK:STDOUT:
// CHECK:STDOUT: constraint {
// CHECK:STDOUT: %Self.loc10_45.1: @ForwardDeclaredGeneric.%ForwardDeclaredGeneric.type (%ForwardDeclaredGeneric.type.d68) = symbolic_binding Self, 1 [symbolic = %Self.loc10_45.2 (constants.%Self.301448.3)]
// CHECK:STDOUT: %ForwardDeclaredGeneric.WithSelf.decl = constraint_with_self_decl @ForwardDeclaredGeneric [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc10_45.1
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @GenericType(constants.%T) {
// CHECK:STDOUT: %T.loc4_25.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @GenericType.WithSelf(constants.%T, constants.%Self.301448.1) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Z.WithSelf(constants.%Self.86a) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @GenericZ(constants.%U) {
// CHECK:STDOUT: %U.loc7_22.1 => constants.%U
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @GenericZ.WithSelf(constants.%U, constants.%Self.301448.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclaredGeneric(constants.%T) {
// CHECK:STDOUT: %T.loc9_36.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ForwardDeclaredGeneric.WithSelf(constants.%T, constants.%Self.301448.3) {}
// CHECK:STDOUT:
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