Bug report

It appears PHPStan does not understand the assignment by reference of some PHP native functions like proc_open.

It might be loosely related to #11777.

Code snippet that reproduces the problem

https://phpstan.org/r/dc1d4f91-b22d-4eaa-b796-34a353062477

Expected output

No errors.

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