Rollup merge of #100093 - wcampbell0x2a:unused-parens-for-match-arms, r=petrochenkov

Enable unused_parens for match arms

Fixes: https://github.com/rust-lang/rust/issues/92751

Currently I can't get the `stderr` to work with `./x.py test`, but this should fix the issue. Help would be appreciated!

1 files changed, 14 insertions, 0 deletions

diff --git a/compiler/rustc_lint/src/unused.rs b/compiler/rustc_lint/src/unused.rs
index 53269d18527..b6cf182916c 100644
--- a/compiler/rustc_lint/src/unused.rs
+++ b/compiler/rustc_lint/src/unused.rs
@@ -396,6 +396,7 @@ enum UnusedDelimsCtx {
     LetScrutineeExpr,
     ArrayLenExpr,
     AnonConst,
+    MatchArmExpr,
 }
 
 impl From<UnusedDelimsCtx> for &'static str {
@@ -414,6 +415,7 @@ impl From<UnusedDelimsCtx> for &'static str {
             UnusedDelimsCtx::BlockRetValue => "block return value",
             UnusedDelimsCtx::LetScrutineeExpr => "`let` scrutinee expression",
             UnusedDelimsCtx::ArrayLenExpr | UnusedDelimsCtx::AnonConst => "const expression",
+            UnusedDelimsCtx::MatchArmExpr => "match arm expression",
         }
     }
 }
@@ -805,6 +807,18 @@ impl EarlyLintPass for UnusedParens {
                 }
                 return;
             }
+            ExprKind::Match(ref _expr, ref arm) => {
+                for a in arm {
+                    self.check_unused_delims_expr(
+                        cx,
+                        &a.body,
+                        UnusedDelimsCtx::MatchArmExpr,
+                        false,
+                        None,
+                        None,
+                    );
+                }
+            }
             _ => {}
         }