error[E0317]: `if` may be missing an `else` clause
  --> $DIR/issue-4201.rs:4:12
   |
LL |       } else if false {
   |  ____________^
LL | |
LL | |
LL | |         1
   | |         - found here
LL | |     };
   | |_____^ expected `()`, found 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`.