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Auto merge of #130689 - RalfJung:rustc_nonnull_optimization_guaranteed, r=jieyouxu

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fix rustc_nonnull_optimization_guaranteed docs

As far as I can tell, even back when this was [added](https://github.com/rust-lang/rust/pull/60300) it never *enabled* any optimizations. It just indicates that the FFI compat lint should accept those types for NPO.
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bors 2024-09-22 10:18:59 +00:00
commit 4ae36d906f
4 changed files with 8 additions and 4 deletions
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compiler/rustc_const_eval/src/interpret/call.rs
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@ -234,6 +234,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
// so we implement a type-based check that reflects the guaranteed rules for ABI compatibility.
if self.layout_compat(caller_abi.layout, callee_abi.layout)? {
// Ensure that our checks imply actual ABI compatibility for this concrete call.
// (This can fail e.g. if `#[rustc_nonnull_optimization_guaranteed]` is used incorrectly.)
assert!(caller_abi.eq_abi(callee_abi));
Ok(true)
} else {