stubgen considers some assignments as type alias which aren't

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
devtools

Research direction

Start by locating stubgen's handling of top-level assignments and reproduce the type_map example from the issue. The work is done when ordinary assignments such as type_map = {int: 42} are no longer accepted as type aliases and the generated stub reflects the correct behavior.

Written by the indexing model from the issue text.

Description

bug priority-2-low topic-stubgen

Stubgen is a bit overoptimistic accepting top-level assignments as type alias. For example the code

type_map = {int: 42}
t = type_map[int]

results in

type_map: Any
t = type_map[int]

(This comes from https://github.com/python/mypy/pull/3169#discussion_r136546700)

Dominant language
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