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Auto merge of #124747 - MasterAwesome:master, r=davidtwco

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Support Result<T, E> across FFI when niche optimization can be used (v2)

This PR is identical to #122253, which was approved and merged but then removed from master by a force-push due to a [CI bug](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/ci.20broken.3F).

r? ghost

Original PR description:

---

Allow allow enums like `Result<T, E>` to be used across FFI if the T/E can be niche optimized and the non-niche-optimized type is FFI safe.

Implementation of https://github.com/rust-lang/rfcs/pull/3391
Tracking issue: https://github.com/rust-lang/rust/issues/110503

Additional ABI and codegen tests were added in https://github.com/rust-lang/rust/pull/115372
This commit is contained in:
bors 2024-05-06 00:55:49 +00:00
commit 80420a693f
8 changed files with 830 additions and 77 deletions
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3
compiler/rustc_feature/src/unstable.rs
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@ -579,6 +579,9 @@ declare_features! (
(incomplete, repr128, "1.16.0", Some(56071)),
/// Allows `repr(simd)` and importing the various simd intrinsics.
(unstable, repr_simd, "1.4.0", Some(27731)),
/// Allows enums like Result<T, E> to be used across FFI, if T's niche value can
/// be used to describe E or vise-versa.
(unstable, result_ffi_guarantees, "CURRENT_RUSTC_VERSION", Some(110503)),
/// Allows bounding the return type of AFIT/RPITIT.
(incomplete, return_type_notation, "1.70.0", Some(109417)),
/// Allows `extern "rust-cold"`.