In most of our discussions of this idea, we've assumed that we'd adopt the same
semantics that callback protocols use.
If we do that, then only `lambda a: 3` will type check. In order to type check
both you'd have to make `a` positional-only:
```
def IntToIntFunc(a: int, /) -> int:
...
```
This is one of the reasons I think functions-as-types could be a great idea but
not a good substitute for better callable syntax.
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