error[E0618]: expected function, found `()`
  --> $DIR/suggest-on-bare-closure-call.rs:2:15
   |
LL |     let _ = ||{}();
   |               ^^--
   |               |
   |               call expression requires function
   |
help: if you meant to create this closure and immediately call it, surround the closure with parenthesis
   |
LL |     let _ = (||{})();
   |             ^    ^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0618`.