Add checks for overlapping TupleTypes #4238
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JukkaL
reviewed
Nov 15, 2017
mypy/meet.py
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| if all(is_overlapping_types(ti, si, use_promotions) | ||
| for ti, si in zip(t.items, s.items)): | ||
| return True | ||
| # TODO: Tuple[A, ...] |
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I think that this may work already -- Tuple[A, ...] is represented as an Instance, and the new check below should handle this (TupleType vs. Instance). Can you add a test case and remove this comment if I was correct?
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The case was not handled well, so I added support for it
Since unions can overlap with basically everything, checking for them first gives more confidence in later checks, such as tuple types and type types.
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Added support for @JukkaL the logic is quite different now, so it needs to be re-reviewed... Sorry about that :\ There are many tests that can be added - involving combinations of tuples, namedtuple, varargs, instances and unions; but I prefer to do it in at a different time. |
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Fix #4237.
This is not complete or bulletproof, but it's an improvement.
I don't see where should there be a special case for namedtuple; maybe there shouldn't.