Bug report

PHPStan tells me this function exists:

$func = 'setproctitle';
\PHPStan\dumpType(is_callable($func)); // returns true

But it doesn't 🤷

Code snippet that reproduces the problem

https://phpstan.org/r/c891dbe6-28c6-45e8-9960-32e325e10d44

Expected output

// return false

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