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Incorrect type analysis in some rare circumstances #15151
Description
Bug report
Hi,
Since PHPStan 2.2.10, I am experiencing random incorrect type analysis in rare places; the bug seems more consistent (i.e, less random) in PHP 2.2.12. I have managed to prepare a minimal reproducer: see linked repo.
Code snippet that reproduces the problem
https://github.com/claudepache/phpstan-bug-type
Expected output
The two dumped types should be mixed. No other errors.
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Activity
mergeable commentedon Sep 1, 2026
This bug report is missing a link to reproduction at phpstan.org/try.
It will most likely be closed after manual review.
claudepache commentedon Sep 1, 2026
Additional note. I am able to reproduce the bug with a version of PHPStan installed via composer, but not directly from the source. A possible difference might be the presence of the turbo extension,
but I have not dug further.EDIT: I confirm that the presence of the turbo extension makes a difference (the bug is triggered when the turbo extension is enabled).
staabm commentedon Sep 2, 2026
@ondrejmirtes this is also a recent regression we should consider for a short term release
ondrejmirtes commentedon Sep 2, 2026
I'm also working on this one
Stop interning TypeCombinator results in the turbo extension
phpstan-bot commentedon Sep 2, 2026
Closed via merging phpstan/phpstan-src#6355
Stop interning TypeCombinator results in the turbo extension
github-actions commentedon Oct 4, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.