mypy doesn't warn when arguments are type annotated but the return type isn't annotated #4209
Description
I had a function that passed mypy checks when it shouldn't:
40
41 async def lol(app: App):
42 return 1
This function should generate a warning that it's untyped.
my config.ini:
[mypy]
python_version = 3.6
# otherwise mypy complains about modules without stubs
ignore_missing_imports = True
warn_unused_ignores = True
warn_redundant_casts = True
warn_no_return = True
strict_optional = True
show_traceback = True
show_column_numbers = True
no_implicit_optional = True
disallow_incomplete_defs = True
disallow_untyped_defs = True
disallow_any = generics