================
@@ -2897,6 +2897,15 @@ DEF_TRAVERSE_STMT(LambdaExpr, {
   if (getDerived().shouldVisitImplicitCode()) {
     // The implicit model is simple: everything else is in the lambda class.
     TRY_TO(TraverseDecl(S->getLambdaClass()));
+
+    // The body is normally reached through the call operator of the closure
+    // class. If that declaration is not a definition (which happens when the
+    // closure type was merged with one from another module), visit the body
+    // through the lambda expression.
+    if (CXXMethodDecl *CallOp = S->getCallOperator();
+        CallOp && !CallOp->isThisDeclarationADefinition() &&
+        getDerived().shouldVisitLambdaBody())
+      TRY_TO_TRAVERSE_OR_ENQUEUE_STMT(S->getBody());
----------------
Maoyao233 wrote:

That's why I'm insisting on this: I don't think it's expensive to add an extra 
branch check when visiting a lambda expression; at least, it won't be more 
expensive than exposing the potential **inconsistency** to so many consumers.

https://github.com/llvm/llvm-project/pull/237067
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