False error: "Call to an undefined method ParentClass::getBar()"

[ThomasLandauer]

Bug report

Probably the same as #2874

phpstan/phpstan 0.12.18

Code snippet that reproduces the problem

https://phpstan.org/r/21d50449-fe46-45db-bf63-c5659fc13147

Situation: Parent class with return $this in a Setter. Then instantiate an object of a child class, call the setter, then some other method of the child class.

The root of the problem seems to be the return type self (line 6). phpstan obviously interprets this as ParentClass, not as Child

[ondrejmirtes]

You need @return static: https://phpstan.org/r/9f27ade2-df84-47dd-a233-a8488992678e

[lock]

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