error[E0631]: type mismatch in closure arguments --> $DIR/late-bound-in-borrow-closure-sugg.rs:26:24 | LL | let closure = |trader : Trader| { | ----------------- found signature defined here ... LL | trader.set_closure(closure); | ----------- ^^^^^^^ expected due to this | | | required by a bound introduced by this call | = note: expected closure signature `for<'a, 'b> fn(&'a mut Trader<'b>) -> _` found closure signature `for<'a> fn(Trader<'a>) -> _` note: required by a bound in `Trader::<'a>::set_closure` --> $DIR/late-bound-in-borrow-closure-sugg.rs:15:50 | LL | pub fn set_closure(&mut self, function: impl Fn(&mut Trader) + 'a) { | ^^^^^^^^^^^^^^^ required by this bound in `Trader::<'a>::set_closure` help: consider adjusting the signature so it borrows its argument | LL | let closure = |trader : &mut Trader| { | ++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0631`.