error[E0310]: the parameter type `T` may not live long enough --> $DIR/issue_74400.rs:12:5 | LL | f(data, identity) | ^^^^^^^^^^^^^^^^^ | | | the parameter type `T` must be valid for the static lifetime... | ...so that the type `T` will meet its required lifetime bounds | help: consider adding an explicit lifetime bound | LL | fn g(data: &[T]) { | +++++++++ error[E0310]: the parameter type `T` may not live long enough --> $DIR/issue_74400.rs:12:5 | LL | f(data, identity) | ^^^^^^^^^^^^^^^^^ | | | the parameter type `T` must be valid for the static lifetime... | ...so that the type `T` will meet its required lifetime bounds | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` help: consider adding an explicit lifetime bound | LL | fn g(data: &[T]) { | +++++++++ error[E0310]: the parameter type `T` may not live long enough --> $DIR/issue_74400.rs:12:5 | LL | f(data, identity) | ^^^^^^^^^^^^^^^^^ | | | the parameter type `T` must be valid for the static lifetime... | ...so that the type `T` will meet its required lifetime bounds | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` help: consider adding an explicit lifetime bound | LL | fn g(data: &[T]) { | +++++++++ error: implementation of `Fn` is not general enough --> $DIR/issue_74400.rs:12:5 | LL | f(data, identity) | ^^^^^^^^^^^^^^^^^ implementation of `Fn` is not general enough | = note: `fn(&'2 T) -> &'2 T {identity::<&'2 T>}` must implement `Fn<(&'1 T,)>`, for any lifetime `'1`... = note: ...but it actually implements `Fn<(&'2 T,)>`, for some specific lifetime `'2` error: implementation of `FnOnce` is not general enough --> $DIR/issue_74400.rs:12:5 | LL | f(data, identity) | ^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | = note: `fn(&'2 T) -> &'2 T {identity::<&'2 T>}` must implement `FnOnce<(&'1 T,)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 T,)>`, for some specific lifetime `'2` error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0310`.