error: unnecessary parentheses around `return` value
  --> $DIR/lint-unnecessary-parens.rs:10:12
   |
LL |     return (1);
   |            ^^^ help: remove these parentheses
   |
note: lint level defined here
  --> $DIR/lint-unnecessary-parens.rs:1:9
   |
LL | #![deny(unused_parens)]
   |         ^^^^^^^^^^^^^

error: unnecessary parentheses around `return` value
  --> $DIR/lint-unnecessary-parens.rs:13:12
   |
LL |     return (X { y });
   |            ^^^^^^^^^ help: remove these parentheses

error: unnecessary parentheses around function argument
  --> $DIR/lint-unnecessary-parens.rs:18:9
   |
LL |     bar((true));
   |         ^^^^^^ help: remove these parentheses

error: unnecessary parentheses around `if` condition
  --> $DIR/lint-unnecessary-parens.rs:20:8
   |
LL |     if (true) {}
   |        ^^^^^^ help: remove these parentheses

error: unnecessary parentheses around `while` condition
  --> $DIR/lint-unnecessary-parens.rs:21:11
   |
LL |     while (true) {}
   |           ^^^^^^ help: remove these parentheses

error: unnecessary parentheses around `match` head expression
  --> $DIR/lint-unnecessary-parens.rs:22:11
   |
LL |     match (true) {
   |           ^^^^^^ help: remove these parentheses

error: unnecessary parentheses around `let` scrutinee
  --> $DIR/lint-unnecessary-parens.rs:25:16
   |
LL |     if let 1 = (1) {}
   |                ^^^ help: remove these parentheses

error: unnecessary parentheses around `let` scrutinee
  --> $DIR/lint-unnecessary-parens.rs:26:19
   |
LL |     while let 1 = (2) {}
   |                   ^^^ help: remove these parentheses

error: unnecessary parentheses around method argument
  --> $DIR/lint-unnecessary-parens.rs:40:24
   |
LL |     X { y: false }.foo((true));
   |                        ^^^^^^ help: remove these parentheses

error: unnecessary parentheses around assigned value
  --> $DIR/lint-unnecessary-parens.rs:42:18
   |
LL |     let mut _a = (0);
   |                  ^^^ help: remove these parentheses

error: unnecessary parentheses around assigned value
  --> $DIR/lint-unnecessary-parens.rs:43:10
   |
LL |     _a = (0);
   |          ^^^ help: remove these parentheses

error: unnecessary parentheses around assigned value
  --> $DIR/lint-unnecessary-parens.rs:44:11
   |
LL |     _a += (1);
   |           ^^^ help: remove these parentheses

error: aborting due to 12 previous errors