1 error: implementation of `FnOnce` is not general enough
2 --> $DIR/issue-57611-trait-alias.rs:25:9
5 | ^^^^^ implementation of `FnOnce` is not general enough
7 = note: closure with signature `fn(&'2 X) -> &X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`...
8 = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
10 error: aborting due to previous error