[clang-format] Fix a bug in annotating CastRParen (#102261)

Fixes #102102.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -2874,9 +2874,18 @@ class AnnotatingParser {
       return false;
 
     // Search for unexpected tokens.
-    for (auto *Prev = BeforeRParen; Prev != LParen; Prev = Prev->Previous)
+    for (auto *Prev = BeforeRParen; Prev != LParen; Prev = Prev->Previous) {
+      if (Prev->is(tok::r_paren)) {
+        Prev = Prev->MatchingParen;
+        if (!Prev)
+          return false;
+        if (Prev->is(TT_FunctionTypeLParen))
+          break;
+        continue;
+      }
       if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
         return false;
+    }
 
     return true;
   }

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -740,6 +740,13 @@ TEST_F(TokenAnnotatorTest, UnderstandsCasts) {
   EXPECT_TOKEN(Tokens[10], tok::r_paren, TT_Unknown);
   EXPECT_TOKEN(Tokens[11], tok::amp, TT_BinaryOperator);
 
+  Tokens = annotate("func((void (*)())&a);");
+  ASSERT_EQ(Tokens.size(), 15u) << Tokens;
+  EXPECT_TOKEN(Tokens[4], tok::l_paren, TT_FunctionTypeLParen);
+  EXPECT_TOKEN(Tokens[5], tok::star, TT_PointerOrReference);
+  EXPECT_TOKEN(Tokens[9], tok::r_paren, TT_CastRParen);
+  EXPECT_TOKEN(Tokens[10], tok::amp, TT_UnaryOperator);
+
   auto Style = getLLVMStyle();
   Style.TypeNames.push_back("Foo");
   Tokens = annotate("#define FOO(bar) foo((Foo)&bar)", Style);