[clang-format] Fix a bug in annotating overloaded co_await decl (llvm#124240)

Fixes llvm#124223.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -3784,7 +3784,7 @@ static bool isFunctionDeclarationName(const LangOptions &LangOpts,
         return Next;
       if (Next->is(TT_OverloadedOperator))
         continue;
-      if (Next->isOneOf(tok::kw_new, tok::kw_delete)) {
+      if (Next->isOneOf(tok::kw_new, tok::kw_delete, tok::kw_co_await)) {
         // For 'new[]' and 'delete[]'.
         if (Next->Next &&
             Next->Next->startsSequence(tok::l_square, tok::r_square)) {

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -1025,6 +1025,12 @@ TEST_F(TokenAnnotatorTest, UnderstandsOverloadedOperators) {
   EXPECT_TOKEN(Tokens[6], tok::l_paren, TT_OverloadedOperatorLParen);
   EXPECT_TOKEN(Tokens[8], tok::amp, TT_PointerOrReference);
   EXPECT_TOKEN(Tokens[12], tok::amp, TT_PointerOrReference);
+
+  Tokens = annotate("SomeLoooooooooooooooooType::Awaitable\n"
+                    "SomeLoooooooooooooooooType::operator co_await();");
+  ASSERT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_TOKEN(Tokens[3], tok::identifier, TT_FunctionDeclarationName);
+  EXPECT_TOKEN(Tokens[7], tok::l_paren, TT_OverloadedOperatorLParen);
 }
 
 TEST_F(TokenAnnotatorTest, OverloadedOperatorInTemplate) {