py: enumerate(): Add NotImplementedError for kwargs.

Addresses #577.

py/argcheck.c

@@ -103,3 +103,10 @@ void mp_arg_parse_all(uint n_pos, const mp_obj_t *pos, mp_map_t *kws, uint n_all
         nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "extra keyword arguments given"));
     }
 }
+
+#if MICROPY_CPYTHON_COMPAT
+void mp_arg_error_unimpl_kw() {
+    nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError,
+        "keyword argument(s) not yet implemented - use normal args instead"));
+}
+#endif

py/objenumerate.c

@@ -41,9 +41,14 @@ typedef struct _mp_obj_enumerate_t {
 
 STATIC mp_obj_t enumerate_iternext(mp_obj_t self_in);
 
-/* TODO: enumerate is one of the ones that can take args or kwargs.
-   Sticking to args for now */
 STATIC mp_obj_t enumerate_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
+    /* TODO: enumerate is one of the ones that can take args or kwargs.
+       Sticking to args for now */
+#if MICROPY_CPYTHON_COMPAT
+    if (n_kw != 0) {
+        mp_arg_error_unimpl_kw();
+    }
+#endif
     assert(n_args > 0);
     mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
     o->base.type = &mp_type_enumerate;

py/runtime.h

@@ -56,6 +56,7 @@ void mp_deinit(void);
 
 void mp_arg_check_num(uint n_args, uint n_kw, uint n_args_min, uint n_args_max, bool takes_kw);
 void mp_arg_parse_all(uint n_pos, const mp_obj_t *pos, mp_map_t *kws, uint n_allowed, const mp_arg_t *allowed, mp_arg_val_t *out_vals);
+NORETURN void mp_arg_error_unimpl_kw();
 
 mp_obj_dict_t *mp_locals_get(void);
 void mp_locals_set(mp_obj_dict_t *d);