5880 struct GTY((chain_next ("%h.next"))) tinst_level {  struct
5882   struct tinst_level *next;  argument
5894   tree tldcl, targs;
5918   static void free (tinst_level *obj);  argument
5921   bool list_p () const { return !not_list_p (); }  in list_p()
5926   tree get_node () {  in get_node()
5933   tree maybe_get_node () const {  in maybe_get_node()
5939   location_t locus;
5942   unsigned short errors;
5950   unsigned short refcount;
5953   static const unsigned short refcount_infinity = (unsigned short) ~0;