error: implementation of `Foo` is not general enough --> $DIR/issue-97997.rs:13:5 | LL | ::ASSOC; | ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Foo` is not general enough | = note: `Foo` would have to be implemented for the type `for<'a> fn(&'a u8)` = note: ...but `Foo` is actually implemented for the type `fn(&'0 u8)`, for some specific lifetime `'0` error: implementation of `Foo` is not general enough --> $DIR/issue-97997.rs:13:5 | LL | ::ASSOC; | ^^^^^^^^^^^^^^^^^^^^^^^ implementation of `Foo` is not general enough | = note: `Foo` would have to be implemented for the type `for<'a> fn(&'a u8)` = note: ...but `Foo` is actually implemented for the type `fn(&'0 u8)`, for some specific lifetime `'0` error: aborting due to 2 previous errors