Matthias Krüger 5c10dbd85f Rollup merge of #92704 - 5225225:std_mem_transmute_ref_t_mut_t, r=michaelwoerister ... Change lint message to be stronger for &T -> &mut T transmute The old message implied that it's only UB if you use the reference to mutate, which (as far as I know) is not true. As in, the following program has UB, and a &T -> &mut T transmute is effectively an `unreachable_unchecked`. ```rust fn main() { #[allow(mutable_transmutes)] unsafe { let _ = std::mem::transmute::<&i32, &mut i32>(&0); } } ``` In the future, it might be a good idea to use the edition system to make this a hard error, since I don't think it is *ever* defined behaviour? Unless we rule that `&UnsafeCell<i32> -> &mut i32` is fine. (That, and you always could just use `.get()`, so you're not losing anything)		2022-01-20 17:10:37 +01:00
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src	Rollup merge of #92704 - 5225225:std_mem_transmute_ref_t_mut_t, r=michaelwoerister	2022-01-20 17:10:37 +01:00
Cargo.toml	Migrate to 2021	2021-09-20 22:21:42 -04:00