Bug report

When the assignment into variable is a string, the PHPStan correctly detect, that variable is type of string.
But when the variable is declared as a part of the array definition (for the future usage in the same array), the PHPStan detect the type of the variable as mixed

Code snippet that reproduces the problem

https://phpstan.org/r/ecd2da08-0de4-4291-a956-b65947b1453d

Expected output

No error should be here

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