Oscillating boolean is "always false" #8621
Description
Bug report
A negated Boolean in a loop is used to oscillate between true and false on each iteration of the loop. PHPStan claims the expression is always false. This causes subsequent false positives in conditionals.
Code snippet that reproduces the problem
https://phpstan.org/r/7fffa805-d6b5-4397-a927-9b651294c76d
Expected output
No error.
The loop will ensure that the value changes on each iteration.
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