[clang] [clang][Sema] Fix a bug when instantiating a lambda with requires clause (PR #65193)

[via cfe-commits]

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@@ -567,6 +567,58 @@ bool Sema::addInstantiatedCapturesToScope(
   return false;
 }
 
+static void addDeclsFromParentScope(Sema &S, FunctionDecl *FD,
+                                    LocalInstantiationScope &Scope) {
+  assert(isLambdaCallOperator(FD) && "FD must be a lambda call operator");
+
+  LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(S.getFunctionScopes().back());
+
+  auto captureVar = [&](VarDecl *VD) {
+    LSI->addCapture(VD, /*isBlock=*/false, /*isByref=*/false,
+                    /*isNested=*/false, VD->getBeginLoc(), SourceLocation(),
+                    VD->getType(), /*Invalid=*/false);
+  };
+
+  FD = dyn_cast<FunctionDecl>(FD->getParent()->getParent());
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cor3ntin wrote:

you could use `getLambdaAwareParentOfDeclContext(FD)` here

https://github.com/llvm/llvm-project/pull/65193