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Quick mode crash when run twice in strict-optional mode #3281

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@gvanrossum

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@gvanrossum

In our codebase we have a case where running quick mode twice crashes.

@euresti reported this.

UPDATE: it's something like

$ rm -rf .mypy_cache
$ mypy -i --strict-optional <files>
<lots of errors>
$ mypy -quick --strict-optional <files>
<lots of errors>
$ mypy -quick --strict-optional <files>
<lots of errors>
<crash>
$

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