Bug report

First bad commit: phpstan/phpstan-src@0c740e396c
Worked on: phpstan/phpstan-src@ea5f10aaac

Code snippet that reproduces the problem

https://phpstan.org/r/44b5311c-87bb-4512-801b-5d49c52a91b1

Expected output

Variable is defined for sure, it's assigned when !$package->isMultiDay() and that condition is repeated inside the foreach.

Problem goes away when we remove the assign to $availableIntervals on line 52 (which is completely unrelated to the code above but still causes this problem).

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