1 error[E0317]: if may be missing an else clause
2 --> $DIR/issue-4201.rs:4:12
13 | |_____^ expected (), found integer
15 = note: expected type `()`
16 found type `{integer}`
17 = note: `if` expressions without `else` evaluate to `()`
18 = help: consider adding an `else` block that evaluates to the expected type
20 error: aborting due to previous error
22 For more information about this error, try `rustc --explain E0317`.