1 error[E0277]: the type `&mut &mut &i32` may not be safely transferred across an unwind boundary
2 --> $DIR/not-panic-safe.rs:8:14
4 LL | assert::<&mut &mut &i32>();
5 | ^^^^^^^^^^^^^^ `&mut &mut &i32` may not be safely transferred across an unwind boundary
7 = help: the trait `UnwindSafe` is not implemented for `&mut &mut &i32`
8 = note: `UnwindSafe` is implemented for `&&mut &i32`, but not for `&mut &mut &i32`
9 note: required by a bound in `assert`
10 --> $DIR/not-panic-safe.rs:5:14
12 LL | fn assert<T: UnwindSafe + ?Sized>() {}
13 | ^^^^^^^^^^ required by this bound in `assert`
14 help: consider removing 2 leading `&`-references
16 LL - assert::<&mut &mut &i32>();
17 LL + assert::<&i32>();
20 error: aborting due to previous error
22 For more information about this error, try `rustc --explain E0277`.