[clang-tools-extra] [clang-tidy] Fix assignment-in-if-condition false positive in statement expressions (PR #231704)

[via cfe-commits]

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@@ -45,6 +45,23 @@ void AssignmentInIfConditionCheck::check(
           return true;
         }
 
+        // Only traverse the result expression of a statement expression,
+        // looking through labels and attributes on the last statement.
+        bool TraverseStmtExpr(StmtExpr *SE,
+                              DataRecursionQueue *Queue = nullptr) {
+          Stmt *Last = SE->getSubStmt()->body_back();
+          while (Last && !isa<Expr>(Last))
+            if (auto *LS = dyn_cast<LabelStmt>(Last))
+              Last = LS->getSubStmt();
+            else if (auto *AS = dyn_cast<AttributedStmt>(Last))
+              Last = AS->getSubStmt();
+            else
+              return true;
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mark-zilber wrote:

Yes, we can. Switched to ValueStmt::getExprStmt().

https://github.com/llvm/llvm-project/pull/231704