static bool is_klass_type( DepType dept) { return dept_in_mask(dept, klass_types ); }
static bool has_implicit_context_arg(DepType dept) { return dept_in_mask(dept, implicit_ctxk_types); }
static int dep_context_arg(DepType dept) { return dept_in_mask(dept, ctxk_types)? 0: -1; }