From 1cd293bf45b75dcb54c5bc27a451b96465c554ab Mon Sep 17 00:00:00 2001
From: Ashton Meuser <ashtonmeuser@gmail.com>
Date: Thu, 19 Mar 2026 17:31:09 -0700
Subject: [PATCH] Throw if too deep in syntax

---
 src/Lua/CodeAnalysis/Compilation/Parser.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Lua/CodeAnalysis/Compilation/Parser.cs b/src/Lua/CodeAnalysis/Compilation/Parser.cs
index 6680058d..48a8caa1 100644
--- a/src/Lua/CodeAnalysis/Compilation/Parser.cs
+++ b/src/Lua/CodeAnalysis/Compilation/Parser.cs
@@ -125,6 +125,11 @@ public void LeaveLevel()
 
     public TempBlock EnterLevel()
     {
+        if (!RuntimeHelpers.TryEnsureSufficientExecutionStack())
+        {
+            Scanner.SyntaxError("too many syntax levels");
+        }
+
         Scanner.L.CallCount++;
         CheckLimit(Scanner.L.CallCount, MaxCallCount, "Go levels");
         return new(Scanner.L);