error: expected one of `!`, `(`, `+`, `::`, `<`, or `{`, found `22`
  --> $DIR/closure-return-syntax.rs:5:23
   |
LL |     let x = || -> i32 22;
   |                       ^^ expected one of `!`, `(`, `+`, `::`, `<`, or `{`

error: aborting due to previous error