fix dangling reference in Vec::append#61082
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fix dangling reference in Vec::append Turns out I forgot to enable Miri again for the Vec tests. And there was a dangling reference hiding in there! `get_unchecked_mut` is UB to call on an empty vector (there is no memory to get a reference to), and yet this code did it.
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Rollup of 6 pull requests Successful merges: - #59545 (Use arenas to avoid Lrc in queries #2) - #61054 (Suggest dereferencing on assignment to mutable borrow) - #61056 (tweak discriminant on non-nullary enum diagnostic) - #61082 (fix dangling reference in Vec::append) - #61086 (Box::into_unique: do the reborrow-to-raw *after* destroying the Box) - #61098 (Fix overflowing literal lint in loops) Failed merges: r? @ghost
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Turns out I forgot to enable Miri again for the Vec tests. And there was a dangling reference hiding in there!
get_unchecked_mutis UB to call on an empty vector (there is no memory to get a reference to), and yet this code did it.