1 warning: transmuting &T to &mut T is undefined behavior, even if the reference is unused, consider instead using an UnsafeCell
2 --> $DIR/allowed-cli-deny-by-default-lint.rs:8:17
4 LL | let y = std::mem::transmute::<&i32, &mut i32>(&5);
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 = note: requested on the command line with `--force-warn mutable-transmutes`
9 warning: 1 warning emitted