Fix crash with malformed TypedDicts and disllow-any-expr #13963
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Fixes python#13066 During the semanal phase, mypy opts to ignore and skip processing any malformed or illegal statements inside of a TypedDict class definition, such as method definitions. Skipping semanal analysis on these statements can cause any number of odd downstream problems: the type-checking phase assumes that all semanal-only semantic constructs (e.g. FakeInfo) have been purged by this point, and so can crash at any point once this precondition has been violated. This diff opts to solve this problem by filtering down the list of statements so we keep only the ones we know are legal within a TypedDict definition. The other possible solution to this problem is to modify mypy so we skip checking TypedDict class bodies entirely during type checking and fine-grained deps analysis. Doing this would also let address python#10007 and supersede my other diff python#13732. I decided against doing this for now because: 1. I wasn't sure if this was actually safe, especially in the fine-grained deps phase and for mypyc. 2. I think no matter what, the semanal phase should not leak semanal-only types: relaxing this postcondition would make it harder to reason about mypy. So, we'd probably want to make this change regardless of what we do in the later phases.
|
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
JukkaL
approved these changes
Oct 31, 2022
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Fixes #13066
During the semanal phase, mypy opts to ignore and skip processing any malformed or illegal statements inside of a TypedDict class definition, such as method definitions.
Skipping semanal analysis on these statements can cause any number of odd downstream problems: the type-checking phase assumes that all semanal-only semantic constructs (e.g. FakeInfo) have been purged by this point, and so can crash at any point once this precondition has been violated.
This diff opts to solve this problem by filtering down the list of statements so we keep only the ones we know are legal within a TypedDict definition.
The other possible solution to this problem is to modify mypy so we skip checking TypedDict class bodies entirely during type checking and fine-grained deps analysis. Doing this would also let address #10007 and supersede my other diff #13732.
I decided against doing this for now because: