array.c: fix `mrb_ary_shift_m` initialization bug.
The `ARY_PTR` and `ARY_LEN` may be modified in `mrb_get_args`.
@@ -581,14 +581,16 @@ mrb_ary_shift(mrb_state *mrb, mrb_value self)
static mrb_value
mrb_ary_shift_m(mrb_state *mrb, mrb_value self)
{
- struct RArray *a = mrb_ary_ptr(self);
- mrb_int len = ARY_LEN(a);
mrb_int n;
- mrb_value val;
if (mrb_get_args(mrb, "|i", &n) == 0) {
return mrb_ary_shift(mrb, self);
- };
+ }
+
+ struct RArray *a = mrb_ary_ptr(self);
+ mrb_int len = ARY_LEN(a);
+ mrb_value val;
+
ary_modify_check(mrb, a);
if (len == 0 || n == 0) return mrb_ary_new(mrb);
if (n < 0) mrb_raise(mrb, E_ARGUMENT_ERROR, "negative array shift");
