Bug report

I got the non-sensical error mentioned in the title of this issue in a case where the offending parameter was previously narrowed from mixed to non-empty-array. See code snippet.

Code snippet that reproduces the problem

https://phpstan.org/r/96c0c712-2fca-430c-96b1-448a0d484ab0

Expected output

No error on line 10.

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