error[E0308]: mismatched types --> $DIR/issue-105675.rs:5:5 | LL | thing(f); | ^^^^^^^^ one type is more general than the other | = note: expected trait `for<'a, 'b> FnOnce<(&'a u32, &'b u32, u32)>` found trait `for<'a> FnOnce<(&u32, &'a u32, u32)>` note: this closure does not fulfill the lifetime requirements --> $DIR/issue-105675.rs:4:13 | LL | let f = | _ , y: &u32 , z | (); | ^^^^^^^^^^^^^^^^^^^ note: the lifetime requirement is introduced here --> $DIR/issue-105675.rs:1:18 | LL | fn thing(x: impl FnOnce(&u32, &u32, u32)) {} | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider specifying the type of the closure parameters | LL | let f = |_: &_, y: &u32, z| (); | ~~~~~~~~~~~~~~~~~~~ error[E0308]: mismatched types --> $DIR/issue-105675.rs:5:5 | LL | thing(f); | ^^^^^^^^ one type is more general than the other | = note: expected trait `for<'a, 'b> FnOnce<(&'a u32, &'b u32, u32)>` found trait `for<'a> FnOnce<(&u32, &'a u32, u32)>` note: this closure does not fulfill the lifetime requirements --> $DIR/issue-105675.rs:4:13 | LL | let f = | _ , y: &u32 , z | (); | ^^^^^^^^^^^^^^^^^^^ note: the lifetime requirement is introduced here --> $DIR/issue-105675.rs:1:18 | LL | fn thing(x: impl FnOnce(&u32, &u32, u32)) {} | ^^^^^^^^^^^^^^^^^^^^^^^ error[E0308]: mismatched types --> $DIR/issue-105675.rs:9:5 | LL | thing(f); | ^^^^^^^^ one type is more general than the other | = note: expected trait `for<'a, 'b> FnOnce<(&'a u32, &'b u32, u32)>` found trait `FnOnce<(&u32, &u32, u32)>` note: this closure does not fulfill the lifetime requirements --> $DIR/issue-105675.rs:8:13 | LL | let f = | x, y: _ , z: u32 | (); | ^^^^^^^^^^^^^^^^^^^^^ note: the lifetime requirement is introduced here --> $DIR/issue-105675.rs:1:18 | LL | fn thing(x: impl FnOnce(&u32, &u32, u32)) {} | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider specifying the type of the closure parameters | LL | let f = |x: &_, y: &_, z: u32| (); | ~~~~~~~~~~~~~~~~~~~~~~ error[E0308]: mismatched types --> $DIR/issue-105675.rs:9:5 | LL | thing(f); | ^^^^^^^^ one type is more general than the other | = note: expected trait `for<'a, 'b> FnOnce<(&'a u32, &'b u32, u32)>` found trait `FnOnce<(&u32, &u32, u32)>` note: this closure does not fulfill the lifetime requirements --> $DIR/issue-105675.rs:8:13 | LL | let f = | x, y: _ , z: u32 | (); | ^^^^^^^^^^^^^^^^^^^^^ note: the lifetime requirement is introduced here --> $DIR/issue-105675.rs:1:18 | LL | fn thing(x: impl FnOnce(&u32, &u32, u32)) {} | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider specifying the type of the closure parameters | LL | let f = |x: &_, y: &_, z: u32| (); | ~~~~~~~~~~~~~~~~~~~~~~ error: implementation of `FnOnce` is not general enough --> $DIR/issue-105675.rs:9:5 | LL | thing(f); | ^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&'2 u32, &u32, u32)` must implement `FnOnce<(&'1 u32, &u32, u32)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&'2 u32, &u32, u32)>`, for some specific lifetime `'2` error: implementation of `FnOnce` is not general enough --> $DIR/issue-105675.rs:9:5 | LL | thing(f); | ^^^^^^^^ implementation of `FnOnce` is not general enough | = note: closure with signature `fn(&u32, &'2 u32, u32)` must implement `FnOnce<(&u32, &'1 u32, u32)>`, for any lifetime `'1`... = note: ...but it actually implements `FnOnce<(&u32, &'2 u32, u32)>`, for some specific lifetime `'2` error: aborting due to 6 previous errors For more information about this error, try `rustc --explain E0308`.