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-rw-r--r--py/objnamedtuple.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/py/objnamedtuple.c b/py/objnamedtuple.c
index 214cad2572..b212993506 100644
--- a/py/objnamedtuple.c
+++ b/py/objnamedtuple.c
@@ -108,9 +108,10 @@ STATIC mp_obj_t namedtuple_make_new(const mp_obj_type_t *type_in, size_t n_args,
#endif
}
- // Create a tuple and set the type to this namedtuple
- mp_obj_tuple_t *tuple = MP_OBJ_TO_PTR(mp_obj_new_tuple(num_fields, NULL));
- tuple->base.type = type_in;
+ // Create a namedtuple with explicit malloc. Calling mp_obj_new_tuple
+ // with num_fields=0 returns a read-only object.
+ mp_obj_tuple_t *tuple = mp_obj_malloc_var(mp_obj_tuple_t, mp_obj_t, num_fields, type_in);
+ tuple->len = num_fields;
// Copy the positional args into the first slots of the namedtuple
memcpy(&tuple->items[0], args, sizeof(mp_obj_t) * n_args);