error[E0631]: type mismatch in closure arguments
  --> $DIR/closure-arg-type-mismatch.rs:3:14
   |
LL |     a.iter().map(|_: (u32, u32)| 45);
   |              ^^^ ------------------ found signature of `fn((u32, u32)) -> _`
   |              |
   |              expected signature of `fn(&(u32, u32)) -> _`

error[E0631]: type mismatch in closure arguments
  --> $DIR/closure-arg-type-mismatch.rs:4:14
   |
LL |     a.iter().map(|_: &(u16, u16)| 45);
   |              ^^^ ------------------- found signature of `for<'r> fn(&'r (u16, u16)) -> _`
   |              |
   |              expected signature of `fn(&(u32, u32)) -> _`

error[E0631]: type mismatch in closure arguments
  --> $DIR/closure-arg-type-mismatch.rs:5:14
   |
LL |     a.iter().map(|_: (u16, u16)| 45);
   |              ^^^ ------------------ found signature of `fn((u16, u16)) -> _`
   |              |
   |              expected signature of `fn(&(u32, u32)) -> _`

error: aborting due to 3 previous errors

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