https://github.com/tbaederr created 
https://github.com/llvm/llvm-project/pull/189972

I've run into a problem in a branch lately that would've benefitted from this 
assertion.

>From 4f1550ca7decfd5518e3bf738f8f3f6ee511f763 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <[email protected]>
Date: Wed, 1 Apr 2026 16:58:41 +0200
Subject: [PATCH] [clang][bytecode] Add an assertion in initScope() op

I've run into a problem in a branch lately that would've benefitted from
this assertion.
---
 clang/lib/AST/ByteCode/InterpFrame.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/lib/AST/ByteCode/InterpFrame.cpp 
b/clang/lib/AST/ByteCode/InterpFrame.cpp
index 0d429e773f88f..1c7d65dc28e02 100644
--- a/clang/lib/AST/ByteCode/InterpFrame.cpp
+++ b/clang/lib/AST/ByteCode/InterpFrame.cpp
@@ -97,6 +97,7 @@ void InterpFrame::initScope(unsigned Idx) {
     return;
 
   for (auto &Local : Func->getScope(Idx).locals()) {
+    assert(!localBlock(Local.Offset)->isInitialized());
     localBlock(Local.Offset)->invokeCtor();
   }
 }

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