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URL: http://github.com/phpstan/phpstan/issues/14084

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Reassigning nested array values for in-out parameter does not keep list<T> property for inner array #14084

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Reassigning nested array values for in-out parameter does not keep list<T> property for inner array#14084
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bug
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Easy fixes
@TimWolla

Description

@TimWolla
TimWolla
opened on Feb 10, 2026

Bug report

For array<array-key, list<T>> in-out parameter, I would like to replace the inner T, while maintaining the array and list structure. PHPStan behaves inconsistently.

Related #14083.

Code snippet that reproduces the problem

https://phpstan.org/r/c267f22d-26ab-4e5d-a67b-6a2b9e315054

Expected output

I expected example(), example2() and example3() to have consistently. Either PHPStan should understand that the “current key” is being reassigned (which means that the list property continues to hold) or it should not understand it. But it should not be dependent on nesting level.

The derived type for the “out parameter” should also be consistent with the dumped type at the end of the function (the latter of which is the expected type).

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