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| $ mypy null.py | |
| null.py:16: error: Argument 1 to "foo" has incompatible type "None"; expected "Bar" | |
| Found 1 error in 1 file (checked 1 source file) |
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| from typing import Optional | |
| class Bar: | |
| pass | |
| def foo(b: Bar): | |
| print(b) | |
| def maybe_foo(b: Optional[Bar]): | |
| print(b) | |
| foo(None) | |
| maybe_foo(None) |
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