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## Summary
With this PR, we emit a diagnostic for this case where
previously didn't:
```py
from typing import Literal
def f(m: int, n: Literal[-1, 0, 1]):
# error: [division-by-zero] "Cannot divide object of type `int` by zero"
return m / n
```
## Test Plan
New Markdown test
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| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||
| mdtest.py | ||
| mdtest.py.lock | ||