rust/compiler/rustc_borrowck
bors 768408af12 Auto merge of #121662 - saethlin:precondition-unification, r=RalfJung
Distinguish between library and lang UB in assert_unsafe_precondition

As described in https://github.com/rust-lang/rust/pull/121583#issuecomment-1963168186, `assert_unsafe_precondition` now explicitly distinguishes between language UB (conditions we explicitly optimize on) and library UB (things we document you shouldn't do, and maybe some library internals assume you don't do).

`debug_assert_nounwind` was originally added to avoid the "only at runtime" aspect of `assert_unsafe_precondition`. Since then the difference between the macros has gotten muddied. This totally revamps the situation.

Now _all_ preconditions shall be checked with `assert_unsafe_precondition`. If you have a precondition that's only checkable at runtime, do a `const_eval_select` hack, as done in this PR.

r? RalfJung
2024-03-10 01:23:54 +00:00
..
src Distinguish between library and lang UB in assert_unsafe_precondition 2024-03-08 18:53:58 -05:00
Cargo.toml bump itertools to 0.12 2024-03-08 12:34:05 +03:00
messages.ftl require simd_insert, simd_extract indices to be constants 2024-02-20 07:50:46 +01:00