Don't rely on reprocessing of targets with errors in fine grained mode

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Issue 类型
重构
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
compilers, testing-qa

调研方向

Start by running the [case testWarnUnusedIgnoresFine] scenario with --warn-unused-ignores and confirm the current failure. Trace how fine-grained mode handles targets with errors and reprocessing, then determine how dependency tracking or cached errors should make the case pass without relying on reprocessing.

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描述

needs discussion topic-fine-grained-incremental

Consider this test case:

[case testWarnUnusedIgnoresFine]
# flags: --warn-unused-ignores
import a
[file a.py]
import b
b.x  # type: ignore
[file b.py]
# empty
[file b.py.2]
x = 1
[out]
==
a.py:2: note: unused 'type: ignore' comment

Currently it fails, presumably because we don't reprocess a.py. This however points to a larger potential problem, currently we are relying on reprocessing targets with errors. However, a better idea might be to only rely on fine grained dependencies. Of course, we can cache errors and just show them if a target had errors and was not reprocessed.

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