Detect attributes from typing alias

[davidism]

#17 allowed typing.NoReturn instead of NoReturn, but we do import typing as t for a shorter name.

I know this is similar to the typing.overload issue in PyCQA/pyflakes#561. Alternatively, maybe this can be addressed with a config option like typing_namespace = t to change what name the plugin looks for.

I was trying to run this on our projects as someone brought up an issue with the import in 3.6.0, but was surprised to see no errors reported. Not a huge deal, I can just reference the supported list in your code and do it manually for now.

[asottile]

I'd rather not, the prevailing convention is to import from typing -- aliasing is a slipperly slope down trying to solve the halting problem (what about import typing; x = typing? what if that's conditional?) -- it's basically intractable

I'd recommend not going against the grain and importing from typing ... directly

[davidism]

PyCQA/pyflakes#561 (comment) seems relevant here as well. If someone solves it there, maybe we can revisit this.