pkg/front_end/parser_testcases/inline_class/extension_type_missing_name.dart

extension type (int i) {}
extension type const (int i) {}
extension type .name(int i) {}
extension type const .name(int i) {}
extension type <T>(int i) {}
extension type const <T>(int i) {}
extension type <T>.name(int i) {}
extension type const <T>.name(int i) {}