Mypy doesn't recognize `__loader__` global in Python 3.6

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
64/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
devtools

Research direction

Start by running the reported mypy command with --python-version 3.6 and inspect how built-in module globals such as name are represented in typeshed. The issue is done when loader.name is accepted without the undefined-name error, with the relevant behavior covered by a regression test.

Written by the indexing model from the issue text.

Description

bug false-positive priority-1-normal size-small topic-runtime-semantics 
$ mypy --python-version 3.6 -c 'print(__loader__.name)'
<string>:1: error: Name '__loader__' is not defined

This might be a typeshed issue, but I can't figure out where globals like __name__ defined in typeshed. Feel free to redirect me!

Dominant language
Python
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