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`.