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C++ interop: add a simple unit test for "using enum" #6278

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C++ interop: add a simple unit test for "using enum"
neundorf Oct 26, 2025
601ae1d
Merge branch 'trunk' into TestsForUsingEnum
neundorf Oct 27, 2025
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137 changes: 137 additions & 0 deletions toolchain/check/testdata/interop/cpp/enum/using.carbon
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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/uint.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/enum/using.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/enum/using.carbon

// --- enum.h

enum Enum { a, b, c };
using UEnum = Enum;

enum Other { d };

// --- import_enum.carbon

library "[[@TEST_NAME]]";

import Cpp library "enum.h";

//@dump-sem-ir-begin
fn F() {
let a: Cpp.Enum = Cpp.Enum.a;
let b: Cpp.UEnum = Cpp.UEnum.b;
var c: Cpp.UEnum = Cpp.UEnum.c;
c = b;
}
//@dump-sem-ir-end

// --- fail_wrong_enum.carbon

library "[[@TEST_NAME]]";

import Cpp library "enum.h";

fn F() {
// CHECK:STDERR: fail_wrong_enum.carbon:[[@LINE+7]]:22: error: cannot implicitly convert expression of type `Cpp.Enum` to `Cpp.Other` [ConversionFailure]
// CHECK:STDERR: let c: Cpp.Other = Cpp.UEnum.a;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR: fail_wrong_enum.carbon:[[@LINE+4]]:22: note: type `Cpp.Enum` does not implement interface `Core.ImplicitAs(Cpp.Other)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: let c: Cpp.Other = Cpp.UEnum.a;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
let c: Cpp.Other = Cpp.UEnum.a;

}

// CHECK:STDOUT: --- import_enum.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Enum: type = class_type @Enum [concrete]
// CHECK:STDOUT: %pattern_type.ebf: type = pattern_type %Enum [concrete]
// CHECK:STDOUT: %int_0: %Enum = int_value 0 [concrete]
// CHECK:STDOUT: %int_1: %Enum = int_value 1 [concrete]
// CHECK:STDOUT: %int_2: %Enum = int_value 2 [concrete]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls <CanDestroy>> [concrete]
// CHECK:STDOUT: %facet_value: %type_where = facet_value %Enum, () [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.cd9: type = fn_type @DestroyT.binding.as_type.as.Destroy.impl.Op, @DestroyT.binding.as_type.as.Destroy.impl(%facet_value) [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.0d9: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.cd9 = struct_value () [concrete]
// CHECK:STDOUT: %ptr.47b: type = ptr_type %Enum [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Enum = %Enum.decl
// CHECK:STDOUT: .UEnum = %Enum.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Enum.decl: type = class_decl @Enum [concrete = constants.%Enum] {} {}
// CHECK:STDOUT: %int_0: %Enum = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %int_1: %Enum = int_value 1 [concrete = constants.%int_1]
// CHECK:STDOUT: %int_2: %Enum = int_value 2 [concrete = constants.%int_2]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// 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: %pattern_type.ebf = binding_pattern a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8_24: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %a.ref: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0]
// CHECK:STDOUT: %.loc8: type = splice_block %Enum.ref.loc8_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc8_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8_13: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %Enum = bind_name a, %a.ref
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %pattern_type.ebf = binding_pattern b [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc9_22: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %UEnum.ref.loc9_25: type = name_ref UEnum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %b.ref.loc9: %Enum = name_ref b, imports.%int_1 [concrete = constants.%int_1]
// CHECK:STDOUT: %.loc9: type = splice_block %UEnum.ref.loc9_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc9_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %UEnum.ref.loc9_13: type = name_ref UEnum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %Enum = bind_name b, %b.ref.loc9
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.ebf = binding_pattern c [concrete]
// CHECK:STDOUT: %c.var_patt: %pattern_type.ebf = var_pattern %c.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.var: ref %Enum = var %c.var_patt
// CHECK:STDOUT: %Cpp.ref.loc10_22: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %UEnum.ref.loc10_25: type = name_ref UEnum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %c.ref.loc10: %Enum = name_ref c, imports.%int_2 [concrete = constants.%int_2]
// CHECK:STDOUT: assign %c.var, %c.ref.loc10
// CHECK:STDOUT: %.loc10_13: type = splice_block %UEnum.ref.loc10_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc10_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %UEnum.ref.loc10_13: type = name_ref UEnum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: ref %Enum = bind_name c, %c.var
// CHECK:STDOUT: %c.ref.loc11: ref %Enum = name_ref c, %c
// CHECK:STDOUT: %b.ref.loc11: %Enum = name_ref b, %b
// CHECK:STDOUT: assign %c.ref.loc11, %b.ref.loc11
// CHECK:STDOUT: %facet_value: %type_where = facet_value constants.%Enum, () [concrete = constants.%facet_value]
// CHECK:STDOUT: %.loc10_3: %type_where = converted constants.%Enum, %facet_value [concrete = constants.%facet_value]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.bound: <bound method> = bound_method %c.var, constants.%DestroyT.binding.as_type.as.Destroy.impl.Op.0d9
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.var, %DestroyT.binding.as_type.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr: %ptr.47b = addr_of %c.var
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: