Title: Function with one clause and with a guard expression
Goal: Inline the `f/2' function in the body of the `sort/2' function.
Parameters: [{file,"in9.erl"},{position,50}].
Documentation: The `f/2' function consists of one function clause and it has a guard expression. There is no variable name conflict between the body of the function and the scope of the function application. A case expression is created from the body of the function, from the parameters, patterns and from the guard expression. The function application is replaced with this case expression.
