Rollup merge of #71910 - mibac138:necessary-paren, r=cuviper

Fix unused_parens false positive when using binary operations

Fixes #71290

r? @cuviper who provided instructions

1 files changed, 23 insertions, 0 deletions

diff --git a/src/test/ui/lint/issue-71290-unused-paren-binop.rs b/src/test/ui/lint/issue-71290-unused-paren-binop.rs
new file mode 100644
index 00000000000..24d77e36d94
--- /dev/null
+++ b/src/test/ui/lint/issue-71290-unused-paren-binop.rs
@@ -0,0 +1,23 @@
+// 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
+}
+
+fn y() -> u8 {
+    ({ 0 } + 1)
+}
+
+pub fn foo(a: bool, b: bool) -> u8 {
+    (if a { 1 } else { 0 } + if b { 1 } else { 0 })
+}
+
+pub fn bar() -> u8 {
+    // Make sure nested expressions are handled correctly as well
+    ({ 0 } + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)
+}
+
+fn main() {}