Merge pull request rust-lang#20122 from chenyukang/yukang-fix-remove-parens

Remove unnecessary parens in closure

Author: ChayimFriedman2

src/tools/rust-analyzer/crates/ide-completion/src/completions/fn_param.rs

@@ -195,5 +195,5 @@ fn comma_wrapper(ctx: &CompletionContext<'_>) -> Option<(impl Fn(&str) -> String
         matches!(prev_token_kind, SyntaxKind::COMMA | SyntaxKind::L_PAREN | SyntaxKind::PIPE);
     let leading = if has_leading_comma { "" } else { ", " };
 
-    Some((move |label: &_| (format!("{leading}{label}{trailing}")), param.text_range()))
+    Some((move |label: &_| format!("{leading}{label}{trailing}"), param.text_range()))
 }