ronreiter/interactive-tutorials — pull request #47 by jessielulu (2014-02-18 22:43:38+00:00)
Title: Update Multiple Function Arguments.md

You cannot use the word "return" in the function call for bar so I changed it from "return" to "number" and deleted the ... from the code. Now it actually does yield the expected output of:
The sum is: 6
Result: 1