1 error[E0308]: mismatched types
2 --> $DIR/arg-type-mismatch.rs:16:30
4 LL | fn main() { let i: (); i = f(()); }
5 | ^^ expected isize, found ()
7 = note: expected type `isize`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0308`.