error: implementation of `FnOnce` is not general enough --> $DIR/missing-universe-cause-issue-114907.rs:33:5 | LL | accept(callback); | ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&'2 ())` must implement `FnOnce<(&'1 (),)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 (),)>`, for some specific lifetime `'2` error: implementation of `FnOnce` is not general enough --> $DIR/missing-universe-cause-issue-114907.rs:33:5 | LL | accept(callback); | ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&'2 ())` must implement `FnOnce<(&'1 (),)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 (),)>`, for some specific lifetime `'2` = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: implementation of `FnOnce` is not general enough --> $DIR/missing-universe-cause-issue-114907.rs:33:5 | LL | accept(callback); | ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&'2 ())` must implement `FnOnce<(&'1 (),)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 (),)>`, for some specific lifetime `'2` = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: implementation of `FnOnce` is not general enough --> $DIR/missing-universe-cause-issue-114907.rs:33:5 | LL | accept(callback); | ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&'2 ())` must implement `FnOnce<(&'1 (),)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 (),)>`, for some specific lifetime `'2` = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: higher-ranked subtype error --> $DIR/missing-universe-cause-issue-114907.rs:33:21 | LL | accept(callback); | ^ error: higher-ranked subtype error --> $DIR/missing-universe-cause-issue-114907.rs:33:21 | LL | accept(callback); | ^ | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: aborting due to 6 previous errors