================
@@ -1696,7 +1696,11 @@ static NamedDecl* getLambdaCallOperatorHelper(const 
CXXRecordDecl &RD) {
       RD.getASTContext().DeclarationNames.getCXXOperatorName(OO_Call);
 
   DeclContext::lookup_result Calls = RD.lookup(Name);
-  assert(!Calls.empty() && "Missing lambda call operator!");
+
+  // This can happen while building the lambda.
+  if (Calls.empty())
+    return nullptr;
----------------
cor3ntin wrote:

I added an assert, which hinges on the fact that we don't look at the static 
invoker in cases where the lambda is incomplete.
I agree that having these various states in lambdas is a bit unfortunate, but 
it is a consequence of P2036.
If you have a better solution, I'm all ears!


https://github.com/llvm/llvm-project/pull/138121
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