1error: implementation of `FnOnce` is not general enough 2 --> $DIR/issue-30906.rs:18:5 3 | 4LL | test(Compose(f, |_| {})); 5 | ^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough 6 | 7 = note: `fn(&'2 str) -> T` must implement `FnOnce<(&'1 str,)>`, for any lifetime `'1`... 8 = note: ...but it actually implements `FnOnce<(&'2 str,)>`, for some specific lifetime `'2` 9 10error: aborting due to previous error 11 12