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False positive argument.type (… expects Foo<string|null>, Foo<string|null> given.) #10698
Description
Bug report
With Bleeding Edge and level 5-7 there is a weird error message for the given code:
Parameter
#1$foo of static method Bar::qux() expects Foo<string|null>, Foo<string|null> given.
With level 8/9 the error disappears.
Code snippet that reproduces the problem
https://phpstan.org/r/4b2b137e-e272-466e-96ff-a954af066387
Expected output
No error.
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Activity
VincentLanglet commentedon Aug 2, 2025
Same issue than #9096 (comment)
Fix false positive argument.type for invariant generics with nullable…
phpstan-bot commentedon Sep 10, 2026
Closed via merging phpstan/phpstan-src#6392
github-actions commentedon Oct 12, 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.