Bug report

The assertType has a side effect and resets the type of $from ?? $to.
The first $from ?? $to resets the type of second $from ?? $to.

Code snippet that reproduces the problem

https://phpstan.org/r/0f02aeb3-9e32-40a1-b520-63cf0ee47764

Expected output

There are two thing I want solve

• Don't want assertType to have any side effects
• The first call should not invalidate the type of second call

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