[clang-format] Fix a regression in annotating TrailingReturnArrow (llvm#86624)

Fixes llvm#86559.

(cherry picked from commit a7f4576)

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -3532,6 +3532,8 @@ void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) const {
       }
     } else if (ClosingParen) {
       for (auto *Tok = ClosingParen->Next; Tok; Tok = Tok->Next) {
+        if (Tok->is(TT_CtorInitializerColon))
+          break;
         if (Tok->is(tok::arrow)) {
           Tok->setType(TT_TrailingReturnArrow);
           break;

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -1872,6 +1872,10 @@ TEST_F(TokenAnnotatorTest, UnderstandsTrailingReturnArrow) {
   ASSERT_EQ(Tokens.size(), 12u) << Tokens;
   EXPECT_TOKEN(Tokens[7], tok::arrow, TT_Unknown);
 
+  Tokens = annotate("__attribute__((cold)) C() : Base(obj->func()) {}");
+  ASSERT_EQ(Tokens.size(), 21u) << Tokens;
+  EXPECT_TOKEN(Tokens[13], tok::arrow, TT_Unknown);
+
   // Mixed
   Tokens = annotate("auto f() -> int { auto a = b()->c; }");
   ASSERT_EQ(Tokens.size(), 18u) << Tokens;