Make `ary_concat()` to replace the receiver when it is empty.
MODIFY
src/array.c
src/array.c
@@ -285,11 +285,17 @@ mrb_ary_s_create(mrb_state *mrb, mrb_value klass)
return ary;
}
+static void ary_replace(mrb_state*, struct RArray*, struct RArray*);
+
static void
ary_concat(mrb_state *mrb, struct RArray *a, struct RArray *a2)
{
mrb_int len;
+ if (ARY_LEN(a) == 0) {
+ ary_replace(mrb, a, a2);
+ return;
+ }
if (ARY_LEN(a2) > ARY_MAX_SIZE - ARY_LEN(a)) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "array size too big");
}

Make `ary_concat()` to replace the receiver when it is empty.