Thanks to Eric Traut who tested all the code examples in Pyright and
raised implementation concerns about ``Self`` type in aliases.
I ran into implementation issues in Pyre too. This is because Pyre
preprocesses things like ``Self`` in an early phase and does alias
resolution in a later phase. Mixing the two would lead to a lot of
hacks.
Pradeep Kumar
Adam Turner
Jelle Zijlstra