Closed
Description
Sometimes mypy doesn't generate an error for a module in incremental mode, even if a previous run generated errors and nothing has changed.
To reproduce, first create these two files:
# a.py
import b
b.f()# b.py
def f() -> None: passThen run mypy, and no errors are reported (as expected):
$ mypy -i a.py
Now edit b.py like this:
# b.py (2)
def f(x) -> None: passRun mypy again, and it correctly reports an error:
$ mypy -i a.py
a.py:3: error: Too few arguments for "f"
Finally, run mypy again without changing anything, and it incorrectly gives clean output:
$ mypy -i a.py
$ <--- no error reported
The expected output is the same error as in the previous run, since nothing has changed.