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warning: transmuting &T to &mut T is undefined behavior, even if the reference is unused, consider instead using an UnsafeCell
--> $DIR/deny-by-default-lint.rs:7:17
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LL | let y = std::mem::transmute::<&i32, &mut i32>(&5);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: requested on the command line with `--force-warn mutable-transmutes`
warning: 1 warning emitted
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