New semantic analyzer: fix issues with 'X = X' assignments #7144
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ilevkivskyi
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Jul 3, 2019
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ilevkivskyi
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Special-casing this makes sense. I have couple minor suggestions.
| # Fall back to normal assignment analysis. | ||
| return False | ||
| else: | ||
| self.defer() |
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name_not_defined() currently already calls defer(), is this additional defer actually needed?
Also this returns True, I would make it more clear by putting the return directly here.
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The fact that name_not_defined calls defer requires some pretty subtle reasoning so I'd rather keep make it explicit here.
mypy/newsemanal/semanal.py
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| node.node = sym.node | ||
| node.kind = GDEF | ||
| node.fullname = sym.node.fullname() | ||
| return True |
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With the above this return can be indented one level more.
| [case testNewAnalyzerIdentityAssignment8] | ||
| from typing import Final | ||
| x: Final = 0 | ||
| x = x # E: Cannot assign to final name "x" |
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Great to see so detailed test cases!
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We special case these since a more general fix, such as looking
at line numbers of definitions, would break a ton of test cases.
Fixes #6404.