rust/tests/ui/lint/force-warn/allowed-deny-by-default-lin...

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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/allowed-deny-by-default-lint.rs:9:17
|
LL | let y = std::mem::transmute::<&i32, &mut i32>(&5);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: requested on the command line with `--force-warn mutable-transmutes`
warning: 1 warning emitted