Fix some crashes in dataclasses #8271
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Store the type of an attribute in `DataclassAttribute` so we don't need to pull it out of `TypeInfo` in a fragile way (since the child might try to override it in a way that breaks things). This also allows us to get rid of some pretty dodgy code having to do with InitVars (that could cause an incremental mode crash.) Fixes #6809 and an unreported incremental bug
JukkaL
reviewed
Jan 13, 2020
| assert attr.is_init_var and not attr.is_in_init | ||
| continue | ||
| if node.type is None: | ||
| if attr.type is None: |
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What if the some attribute has no type? We seem to handle this case during deserialization, so maybe it can happen here as well. Could this result in always deferring for some attribute? If not, maybe we should require that the serialized type is not None?
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We only consider something as being an attribute if it has a type annotation, so the type missing is (should be) always due to resolution issues that can be fixed by deferring.
I think we can only serialize things with non-None types, yeah.
JukkaL
approved these changes
Jan 16, 2020
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Store the type of an attribute in
DataclassAttributeso we don'tneed to pull it out of
TypeInfoin a fragile way (since the childmight try to override it in a way that breaks things). This also
allows us to get rid of some pretty dodgy code having to do with
InitVars (that could cause an incremental mode crash.)
Fixes #6809 and an unreported incremental bug