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Rollup merge of rust-lang#61082 - RalfJung:vec, r=alexcrichton
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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