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error[E0271]: type mismatch resolving `<[u8; 1] as KnownLayout>::PointerMetadata == usize`
--> tests/ui-stable/transmute-mut-src-unsized.rs:17:35
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17 | const SRC_UNSIZED: &mut [u8; 1] = transmute_mut!(&mut [0u8][..]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found `()`
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= note: required for `Wrap<&mut [u8], &mut [u8; 1]>` to implement `TransmuteMutDst<'_>`
= note: this error originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
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