Bug report

If a variable is defined inside match like match($var = something()), this variable is able to be used inside the switch, but since PHPStan 1.10.20, this no longer works correctly, as seen here: https://github.com/pmmp/PocketMine-MP/actions/runs/5333226570/jobs/9663426460?pr=5849

Code snippet that reproduces the problem

https://phpstan.org/r/354f6b51-4a21-4db1-83a4-dc8098bee27a

Expected output

No error should be reported: this is valid working code.

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