From 375253d0e9c12608c3084dbd737fb2f931476dd4 Mon Sep 17 00:00:00 2001
From: Younan Zhang <zyn7109@gmail.com>
Date: Fri, 10 Jan 2025 17:02:56 +0800
Subject: [PATCH] Fix inConstraintSubstitution()

---
 clang/include/clang/Sema/Sema.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 87d9a335763e319..855782d5c926b0f 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -13509,7 +13509,8 @@ class Sema final : public SemaBase {
 
   /// Determine whether we are currently performing constraint substitution.
   bool inConstraintSubstitution() const {
-    return CodeSynthesisContexts.size() > NonConstraintSubstitutionEntries;
+    return NonConstraintSubstitutionEntries &&
+           CodeSynthesisContexts.size() >= NonConstraintSubstitutionEntries;
   }
 
   using EntityPrinter = llvm::function_ref<void(llvm::raw_ostream &)>;