File "abstract_implement2.php", line 20, characters 7-12:
This object is of type BClass (Typing[4110])
File "abstract_implement2.php", line 20, characters 22-27:
It is incompatible with this object of type AClass
because some declarations are incompatible.
Read the following to see why:
File "abstract_implement2.php", line 20, characters 29-32:
This is a bool
File "abstract_implement2.php", line 18, characters 43-43:
  via this generic T
File "abstract_implement2.php", line 15, characters 26-26:
  via this generic T
File "abstract_implement2.php", line 21, characters 26-28:
It is incompatible with an int
