error[E0308]: mismatched types
  --> $DIR/old-closure-expression-remove-semicolon.rs:8:19
   |
LL |       let _x: i32 = {
   |  ___________________^
LL | |
LL | |         foo();
   | |              - help: remove this semicolon to return this value
LL | |     };
   | |_____^ expected `i32`, found `()`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.