Rename variable name to get clean output for CMD-R when using Ruby 1.9+


![Screen Shot 2013-04-09 at 14 39 49](https://f.cloud.github.com/assets/7542/356856/403768f6-a117-11e2-9533-2b81c090ef59.png)

When using Ruby versions >= 1.9 to run scripts via CMD-R, the warning
"shadowing outer local variable" is generated (assuming the -w switch
is set) and copied to the output window.

Renames the inner variable to avoid the message and get a clean output.