Summary of a problem or a feature request

"Variable $key might not be defined." reported incorrectly. The $key variable is a scalar bool value (not a reference) and it is assigned only once.

Code snippet that reproduces the problem

https://phpstan.org/r/a8eba03f-946a-426f-90af-7575659a6a9e

Expected output

Do not report this.