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carbon-lang/toolchain/check/testdata/interop/cpp/const/access.carbon
T
Nicholas Bishop 36d9bed4ca Fix accessing members of const/partial types (#7406)
In `PerformActionHelper`, use the unqualified type for lookup.

In `PerformInstanceBinding`, propagate qualifiers to the unbound element
type's class type when doing the `ConvertToValueOrRefOfType` conversion,
and to the element type when forming the `ClassElementAccess` instr
(except for `partial`, which is only used if the member being accessed
is `base`).

In handle_operator.cpp, prevent assignment to a reference to a const
type.
2026-06-25 00:07:39 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/const/access.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/const/access.carbon
// --- const_member_access.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
struct S {
int x;
};
const S& Get();
''';
fn F() {
Cpp.Get().x;
}
// --- fail_const_member_assign.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
struct S {
int x;
};
const S& Get();
''';
fn F() {
// CHECK:STDERR: fail_const_member_assign.carbon:[[@LINE+11]]:3: error: expression is not assignable [AssignmentToNonAssignable]
// CHECK:STDERR: Cpp.Get().x = 123;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_const_member_assign.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.IntLiteral` to `const i32` [ConversionFailure]
// CHECK:STDERR: Cpp.Get().x = 123;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_const_member_assign.carbon:[[@LINE+4]]:3: note: type `Core.IntLiteral` does not implement interface `Core.ImplicitAs(const i32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: Cpp.Get().x = 123;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.Get().x = 123;
}
// --- fail_const_member_assign_cast.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
struct S {
int x;
};
const S& Get();
''';
fn F() {
// CHECK:STDERR: fail_const_member_assign_cast.carbon:[[@LINE+4]]:3: error: expression is not assignable [AssignmentToNonAssignable]
// CHECK:STDERR: Cpp.Get().x = 123 as i32;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.Get().x = 123 as i32;
}