Unexpected unused type ignore fix overrides#16675
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seddonym wants to merge 8 commits intopython:masterfrom
Closed
Unexpected unused type ignore fix overrides#16675seddonym wants to merge 8 commits intopython:masterfrom
seddonym wants to merge 8 commits intopython:masterfrom
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This test currently fails with this error:
AssertionError: Command 3 (dmypy check -- bar.py) did not give expected output
--- Captured stderr call ---
Expected:
bar.py:2: error: Unused "type: ignore" comment (diff)
== Return code: 1 (diff)
Actual:
(empty)
It demonstrates a bug that when an module is removed using
`FineGrainedBuildManager.update` because it is not "seen" by
`fine_grained_increment_follow_imports`, then "unused type: ignore"
warnings disappear from subsequent checks.
Ref: python#9655
This test fails with the error:
AssertionError: Command 3 (dmypy check -- bar.py) did not give expected output
--- Captured stderr call ---
Expected:
bar.py:2: error: "type: ignore" comment without error code [ignore-without-code] (diff)
== Return code: 1 (diff)
Actual:
(empty)
This test illustrates that '"type: ignore" comment without error code'
errors currently disappear in the same way that 'Unused "type: ignore"'
errors do as described in python#9655.
Ref: python#9655
This test fails with the error:
AssertionError: Command 3 (dmypy check -- bar.py) did not give expected output
--- Captured stderr call ---
Expected:
bar.py:4: error: Name "a" may be undefined [possibly-undefined] (diff)
== Return code: 1 (diff)
Actual:
(empty)
This test illustrates that possibly-undefined errors currently disappear
in the same way that 'Unused "type: ignore"' errors do as described in python#9655.
Ref: python#9655
These tests show how some errors disappear on a re-run of dmypy after a file is altered.
This which fixes issue python#9655 wherein some types of error would be lost when a file was re-processed by dmypy. Regression tests are also included. This also fixes another error where sometimes files would not be re-processed by dmypy if the only error in the file was either "unused type ignore" or "ignore without code".
This catches a regression caused by the previous commits where "type: ignore" comments are erroneously marked as unused in re-runs of dmypy. As far as I can tell, this only happens in modules which contain an import that we don't know how to type (such as a module which does not exist), and a submodule which is unused.
Before this change, fine-grained builds could spuriously mark ignored legitimate errors as "unused ignores". By keeping track of these ignored errors we ensure that enough analysis is done to know that the ignored lines are actually useful. We have to change is_errors_for_file so that we don't consider files as faulty when all of their errors were hidden.
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This is a demo PR to support #15043.
It demonstrates how adding
overridedecorators gets most of the newly failing tests passing (just look at the final commit).Outstanding tests