checkexpr: broader fast path for literal container expressions #14274
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The original implementation was very conservative and bailed whenever a type context was present, drastically limiting its reach. There are a number of type contexts where the fast path can safely be taken. Most importantly: - Any - matching container types
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Diff from mypy_primer, showing the effect of this PR on open source code: cwltool (https://github.com/common-workflow-language/cwltool)
+ cwltool/builder.py: note: In member "generate_arg" of class "Builder":
+ cwltool/builder.py:625:24: error: Redundant cast to "List[str]" [redundant-cast]
core (https://github.com/home-assistant/core)
- homeassistant/components/litterrobot/sensor.py:83: error: Returning Any from function declared to return "bool" [no-any-return]
- homeassistant/components/litterrobot/sensor.py:89: error: Returning Any from function declared to return "bool" [no-any-return]
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The original implementation was very conservative and bailed whenever a type context
was present, drastically limiting its reach.
There are a number of type contexts where the fast path can safely be taken.
Most importantly:
Fixes #14271