Wrong "dead catch" error, side effects of ArrayAccess not considered #11427

Bug report

The implementation of ArrayAccess can throw exceptions, causing statements like unset($x[1]); actually throw.

Of the examples in the sample link, only $x[1] = ... correctly assumes an exception might be thrown (i.e. offsetSet), while offsetGet/offsetExists/offsetUnset are not considered.

https://3v4l.org/J4RXD

Code snippet that reproduces the problem

https://phpstan.org/r/6d994e87-1f2d-4473-921c-7acd9b810661

Expected output

No errors

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