Title: Select two expressions without variables
Goal: Generalize the function `f/1' by selecting the expressions `g(1), g(2)', the new parameter is `G'.
Parameters: [{file,"gen8.erl"},{posrange,{42,53}},{varname,"G"}].
Documentation: The selection contains two expressions, so a new fun expression is created and added to every call of the function. There is not any variable with the name `G', so it is possible to introduce a new pattern and replace the expressions `g(1), g(2)' with an application. The name of the application is the new variable name. 
