error[E0631]: type mismatch in closure arguments
  --> $DIR/expect-infer-var-appearing-twice.rs:14:5
   |
LL | / fn with_closure<F, A>(_: F)
LL | |     where F: FnOnce(A, A)
LL | | {
LL | | }
   | |_- required by `with_closure`
...
LL |       with_closure(|x: u32, y: i32| {
   |       ^^^^^^^^^^^^ ---------------- found signature of `fn(u32, i32) -> _`
   |       |
   |       expected signature of `fn(_, _) -> _`

error: aborting due to previous error