| error: unsatisfied lifetime constraints | |
| --> $DIR/issue-40510-1.rs:18:9 | |
| | | |
| LL | || { | |
| | -- | |
| | || | |
| | |return type of closure is &'2 mut std::boxed::Box<()> | |
| | lifetime `'1` represents this closure's body | |
| LL | &mut x | |
| | ^^^^^^ return requires that `'1` must outlive `'2` | |
| | | |
| = note: closure implements `FnMut`, so references to captured variables can't escape the closure | |
| error: aborting due to previous error | |