Title: Give a non-legal variable name
Goal: Generalize the function `swap_add/1' by selecting the subexpression `1', the new parameter name is `one'.
Parameters: [{file,"gen3.erl"},{posrange,{61,61}},{varname,"one"}].
Documentation: The name `one' is begin with a lowercase. It is not a legal variable name, so the refactoring refuse to perform the transformation.
