mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +01:00
Richard Smith
d60900cbeb
When returning a value from a function whose return type has a by-copy initializing representation, perform initialization like we do when the return type has an in-place initializing representation. This makes our SemIR representation more uniform, as the return expression will now always be an initializing expression rather than a value expression, but more importantly it means that attempts to return a non-copyable type by value now fail, even if the type has a by-copy initializing representation. This catches a bunch of places where we were returning a value of an unconstrained template parameter `T:! type`, which we were incorrectly allowing because we didn't notice it was not copyable. Unfortunately this then requires quite a few test updates. Like #6034, this exposes a lowering issue where lowering crashes when attempting to lower a specific copy operation for certain types; a couple more tests are temporarily disabled here. An upcoming PR dependent on this one will fix the issue and re-enable those tests.
26 lines
658 B
Plaintext
26 lines
658 B
Plaintext
// 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
|
|
|
|
package Core library "prelude/operators/as";
|
|
|
|
import library "prelude/copy";
|
|
|
|
interface UnsafeAs(Dest:! type) {
|
|
fn Convert[self: Self]() -> Dest;
|
|
}
|
|
|
|
interface As(Dest:! type) {
|
|
// TODO: extend UnsafeAs(Dest);
|
|
fn Convert[self: Self]() -> Dest;
|
|
}
|
|
|
|
interface ImplicitAs(Dest:! type) {
|
|
// TODO: extend As(Dest);
|
|
fn Convert[self: Self]() -> Dest;
|
|
}
|
|
|
|
impl forall [T:! Copy] T as ImplicitAs(T) {
|
|
fn Convert[self: Self]() -> Self { return self.(Copy.Op)(); }
|
|
}
|