| 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 | |
| | | |
| 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 | |