[clang] [clang-format] Fix crash on malformed operator input (PR #199098)

[via cfe-commits]

https://github.com/mygitljf updated https://github.com/llvm/llvm-project/pull/199098

>From 737bbf94b817aaf551154437f23f1751dfbbc367 Mon Sep 17 00:00:00 2001
From: mygitljf <2410316423 at qq.com>
Date: Sun, 7 Jun 2026 10:52:04 +0000
Subject: [PATCH] Guard malformed operator scan

---
 clang/lib/Format/TokenAnnotator.cpp   | 3 ++-
 clang/unittests/Format/FormatTest.cpp | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 43e4f6796b6dd..bc2eabaaaba95 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1690,7 +1690,8 @@ class AnnotatingParser {
         }
       }
       while (CurrentToken &&
-             CurrentToken->isNoneOf(tok::l_paren, tok::semi, tok::r_paren)) {
+             CurrentToken->isNoneOf(tok::l_paren, tok::semi, tok::r_paren,
+                                    tok::r_brace)) {
         if (CurrentToken->isOneOf(tok::star, tok::amp))
           CurrentToken->setType(TT_PointerOrReference);
         auto Next = CurrentToken->getNextNonComment();
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 83e2c5b38ceaf..7ffe5950f9834 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -14381,6 +14381,7 @@ TEST_F(FormatTest, IncorrectCodeUnbalancedBraces) {
   verifyNoCrash("struct Foo {\n"
                 "  operator foo(bar\n"
                 "};");
+  verifyNoCrash("{ operator } a");
   verifyNoCrash("decltype( {\n"
                 "  {");
 }