error: expected `{`, found `22`
  --> $DIR/closure-return-syntax.rs:5:23
   |
LL |     let x = || -> i32 22;
   |                       ^^ expected `{`
   |
help: try placing this code inside a block
   |
LL |     let x = || -> i32 { 22 };
   |                       +    +

error: aborting due to previous error