Title: Function with a list in the argument list
Goal: Inline the `add/2' function in the body of the `f/1' function.
Parameters: [{file,"in18.erl"},{position,47}].
Documentation: The function `add21' function has one function clause. There are no variable name conflicts. The inline of the function application is allowed. The function application is replaced with a match expression and with the body of the function.
