error[E0317]: if may be missing an else clause
  --> $DIR/issue-19991.rs:5:5
   |
LL | /     if let Some(homura) = Some("madoka") {
LL | |
LL | |
LL | |
LL | |         765
   | |         --- found here
LL | |     };
   | |_____^ expected (), found integer
   |
   = note: expected type `()`
              found type `{integer}`
   = note: `if` expressions without `else` evaluate to `()`
   = help: consider adding an `else` block that evaluates to the expected type

error: aborting due to previous error

For more information about this error, try `rustc --explain E0317`.