Fix imports being unsilenced when checking stale SCCs #2037
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This commit fixes a bug where silenced imports were being unsilenced after incremental mode + silent_imports was run several times after forcing an SCC to be rechecked.
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Whee! Don't worry about writing that test for now. |
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This pull request fixes an edge case where previously silenced imports were being un-silenced when using silent imports with incremental mode.
Unfortunately, I wasn't able to provide a test case because this problem seems to manifest mainly in larger code bases (with import cycles?) that are hard to simplify and after running incremental mode at least 3 times -- our test suite can currently handle only three. See #2036 for more details about the bug.
The problem ended up being with the order in which the
parse_file(...)andload_graph(...)functions are called -- the former function will mark imports with the# type: ignoredirectives as suppressed and the latter function corrects the dependencies computed byparse_fileand will mark silenced modules as suppressed.The problem is that when running mypy with a cold cache, the
parse_filefunction will be executed at the start of theload_graphfunction, but when checking a stale SCC, the logic will end up makingparse_filebe executed after theload_graphfunction.This is problematic since
parse_filewill potentially clobber over the (often correct) information regarding suppressed and unsuppressed dependencies that was loaded from the old cache files.This fix adds an extra pass over the dependencies after calling
parse_filewhen checking stale SCCs to correct the clobbering.