1 error[E0308]: mismatched types
2 --> $DIR/issue-48838.rs:2:14
5 | ^^^^^ expected `isize`, found closure
7 = note: expected type `isize`
8 found closure `[closure@$DIR/issue-48838.rs:2:14: 2:17]`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0308`.