Title: Select a guard expression
Goal: Generalize the function `f/2' by selecting the guard expression `A =:= B', the a new parameter is `Equal'.
Parameters: [{file,"gen24.erl"},{posrange,{47,53}},{varname,"Equal"}].
Documentation: The selected guard is a conjunction. There is not any variable
 with the name `Positive', so it is possible to introduce a new pattern and 
 replace this conjunction with a simple variable with the name `Positive'. 
 But the function call in the body of the `h/1' function has a side-effect,
 so we should refuse the transformation and do not duplicate the side-effect.
