Conversion from distinct in `for` forces a copy of underlying instance

[arnetheduck]

Nim Version

2.2.6

Description

type
  Large = array[1024, byte]
  List = distinct seq[Large]

var
  ok: seq[Large]
  broken: List

for i in ok:
  discard i

for i in seq[Large](broken):
  discard i

		NI i_1;
		NI L_1;
		NI T2_;
		i_1 = ((NI)0);
		T2_ = ok__testit_u4.len;
		L_1 = T2_;
		{
			while (1) {
				if (!(i_1 < L_1)) goto LA4;
				i__testit_u26 = ok__testit_u4.p->data[i_1];
				(void)(i__testit_u26);
				i_1 += ((NI)1);
			} LA4: ;
		}
	}
	{
		tySequence__9aaOxtCZgU05BzfyirOAtcA colontmp_;
		tySequence__9aaOxtCZgU05BzfyirOAtcA colontmpD_;
		NI i_2;
		NI L_2;
		NI T6_;
		colontmp_.len = 0; colontmp_.p = NIM_NIL;
		colontmpD_.len = 0; colontmpD_.p = NIM_NIL;
		colontmpD_ = eqdup___testit_u173(broken__testit_u5);
		colontmp_ = colontmpD_;
		i_2 = ((NI)0);
		T6_ = colontmp_.len;
		L_2 = T6_;
		{
			while (1) {
				if (!(i_2 < L_2)) goto LA8;
				i__testit_u30 = colontmp_.p->data[i_2];
				(void)(i__testit_u30);
				i_2 += ((NI)1);
			} LA8: ;
		}

spot the eqdup - ditto for refc

Current Output

Expected Output

Known Workarounds

No response

Additional Information

No response