"Yield value expected" on generator using send() #10997
Description
Bug Report
mypy doesn't allow empty yield statements in generator functions that accept send() values
To Reproduce
from typing import Any, Generator
def foo() -> Generator[int, Any, None]:
yield
while True:
yield 42Expected Behavior
I expected the second parameter (Any) in Generator[int, Any, None] to indicate that this generator accepts a send() value and that therefore the naked yield statement is accepting a value but not sending one. As far as I know the above code is idiomatic.
Actual Behavior
error: Yield value expected
mypy complains that a yield value is expected, but this standalone yield is for the purpose of accepting the value of a send() to the generator.
Your Environment
mypy 0.812
python 3.7