_template_decl GTY ((tag ("TS_CP_TEMPLATE_DECL"))) template_decl;
  struct tree_deferred_parse GTY ((tag ("TS_CP_DEFERRED_PARSE"))) deferred_parse;
  struct tree_deferred_noexcept GTY ((tag ("TS_CP_DEFERRED_NOEXCEPT"))) deferred_noexcept;
  struct lang_identifier GTY ((tag ("TS_CP_IDENTIFIER"))) identifier;
  struct tree_static_assert GTY ((tag ("TS_CP_STATIC_ASSERT")))
    static_assertion;
  struct tree_argument_pack_select GTY ((tag ("TS_CP_ARGUMENT_PACK_SELECT")))
    argument_pack_select;
  struct tree_trait_expr GTY ((tag ("TS_CP_TRAIT_EXPR")))
    trait_expression;
  struct tree_lambda_expr GTY ((tag ("TS_CP_LAMBDA_EXPR")))
    lambda_expression;
  struct tree_template_info GTY ((tag ("TS_CP_TEMPLATE_INFO")))
    template_info;
  struct tree_constraint_info GTY ((tag ("TS_CP_CONSTRAINT_INFO")))
    constraint_info;
  struct tree_userdef_literal GTY ((tag ("TS_CP_USERDEF_LITERAL")))
    userdef_literal;
};