`lambda: (yield)` causes spurious errors
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start by reproducing the two snippets in mypy and compare the diagnostics for a lambda containing yield with the decorated function form. No source file or test is named; done means the lambda form no longer produces the spurious type-inference or yield-value errors.
Written by the indexing model from the issue text.
Description
Consider:
noop_ctxmgr = contextmanager(lambda: (yield))
Error:
f.py:11: error: Cannot infer type argument 1 of "contextmanager"
f.py:11: error: Yield value expected
This passes with no errors:
@contextmanager
def noop_ctxmgr():
yield
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