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error[E0308]: mismatched types
--> $DIR/issue-57611-trait-alias.rs:21:9
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LL | |x| x
| ^^^^^ one type is more general than the other
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= note: expected trait `for<'r> Fn<(&'r X,)>`
found trait `Fn<(&X,)>`
note: this closure does not fulfill the lifetime requirements
--> $DIR/issue-57611-trait-alias.rs:21:9
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LL | |x| x
| ^^^
error: implementation of `FnOnce` is not general enough
--> $DIR/issue-57611-trait-alias.rs:21:9
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LL | |x| x
| ^^^^^ implementation of `FnOnce` is not general enough
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= note: closure with signature `fn(&'2 X) -> &X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`...
= note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0308`.
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