error[E0631]: type mismatch in closure arguments
  --> $DIR/closure-arg-type-mismatch-issue-45727.rs:3:24
   |
LL |     let _ = (-10..=10).find(|x: i32| x.signum() == 0);
   |                        ^^^^ -------- found signature defined here
   |                        |
   |                        expected due to this
   |
   = note: expected closure signature `for<'a> fn(&'a {integer}) -> _`
              found closure signature `fn(i32) -> _`
note: required by a bound in `find`
  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
help: consider borrowing the argument
   |
LL |     let _ = (-10..=10).find(|x: &i32| x.signum() == 0);
   |                                 +

error[E0631]: type mismatch in closure arguments
  --> $DIR/closure-arg-type-mismatch-issue-45727.rs:4:24
   |
LL |     let _ = (-10..=10).find(|x: &&&i32| x.signum() == 0);
   |                        ^^^^ ----------- found signature defined here
   |                        |
   |                        expected due to this
   |
   = note: expected closure signature `for<'a> fn(&'a {integer}) -> _`
              found closure signature `for<'a, 'b, 'c> fn(&'a &'b &'c i32) -> _`
note: required by a bound in `find`
  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
help: do not borrow the argument
   |
LL -     let _ = (-10..=10).find(|x: &&&i32| x.signum() == 0);
LL +     let _ = (-10..=10).find(|x: &i32| x.signum() == 0);
   |

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0631`.