Update src/test/ui/lint/issue-71290-unused-paren-binop.rs

Co-authored-by: Bastian Kauschke <[email protected]>

Author: mibac138

src/test/ui/lint/issue-71290-unused-paren-binop.rs

@@ -1,6 +1,7 @@
 // check-pass
 // Make sure unused parens lint doesn't emit a false positive.
 // See https://github.com/rust-lang/rust/issues/71290 for details.
+#![deny(unused_parens)]
 
 fn x() -> u8 {
     ({ 0 }) + 1