From bf1e96d6206e8f551680f5929e00afb09092deb1 Mon Sep 17 00:00:00 2001
From: Zequan Wu <zequanwu@google.com>
Date: Wed, 8 Jun 2022 17:08:22 -0700
Subject: [PATCH] [MicrosoftDemangle] Set error to true when returning nullptr.

---
 llvm/lib/Demangle/MicrosoftDemangle.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Demangle/MicrosoftDemangle.cpp b/llvm/lib/Demangle/MicrosoftDemangle.cpp
index aca8cf7a0a58..b4e98a20f389 100644
--- a/llvm/lib/Demangle/MicrosoftDemangle.cpp
+++ b/llvm/lib/Demangle/MicrosoftDemangle.cpp
@@ -823,11 +823,15 @@ SymbolNode *Demangler::parse(StringView &MangledName) {
 }
 
 TagTypeNode *Demangler::parseTagUniqueName(StringView &MangledName) {
-  if (!MangledName.consumeFront(".?A"))
+  if (!MangledName.consumeFront(".?A")) {
+    Error = true;
     return nullptr;
+  }
   MangledName.consumeFront(".?A");
-  if (MangledName.empty())
+  if (MangledName.empty()) {
+    Error = true;
     return nullptr;
+  }
 
   return demangleClassType(MangledName);
 }