[clang-format] Annotate r_paren before braced list as TT_CastRParen (#96271)

Fixes #96096.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -2837,6 +2837,11 @@ class AnnotatingParser {
     if (!AfterRParen->Next)
       return false;
 
+    if (AfterRParen->is(tok::l_brace) &&
+        AfterRParen->getBlockKind() == BK_BracedInit) {
+      return true;
+    }
+
     // If the next token after the parenthesis is a unary operator, assume
     // that this is cast, unless there are unexpected tokens inside the
     // parenthesis.

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -662,6 +662,10 @@ TEST_F(TokenAnnotatorTest, UnderstandsCasts) {
   EXPECT_TOKEN(Tokens[3], tok::r_paren, TT_Unknown);
   EXPECT_TOKEN(Tokens[4], tok::amp, TT_BinaryOperator);
 
+  Tokens = annotate("return (struct foo){};");
+  ASSERT_EQ(Tokens.size(), 9u) << Tokens;
+  EXPECT_TOKEN(Tokens[4], tok::r_paren, TT_CastRParen);
+
   Tokens = annotate("#define FOO(bar) foo((uint64_t)&bar)");
   ASSERT_EQ(Tokens.size(), 15u) << Tokens;
   EXPECT_TOKEN(Tokens[10], tok::r_paren, TT_CastRParen);