What files should I navigate to to find the code from these screenshots? Just trying to find it so I can fix this bug. :)

python/mypy#18920 (comment)

If link doesn't work, the relevant code looks like this:

(Image 1 labeled To Reproduce)

from future import annotations
from dataclasses import dataclass
from typing import Self

type HasParent[N] = N | Node[N | HasParent[N]]

class Node[P = None]:
def parent(self) -> P: ... # type: ignore

@DataClass
class CP: Node | None = Node | None:
item: D[Self]

class DP: HasParent[C] = C:
pass

(Image 2 label starts with Changing to Self to the explicit class type (item: D[C]) is accepted.)

class CP: Node | None = Node | None:
def init(self, item: D[Self]):
self.item = item