hadley/devtools — pull request #136 by wch (2012-08-13 00:03:31+00:00)
Title: Function to print parent environments

Demo here: http://rpubs.com/wch/1158

I didn't have it stop at the global environment, because that would lead to behavior that could be confusing to the user. I also think it's useful to have it show all the package environments and the order that they're loaded.

This doesn't display it directly, but you can also tell which packages are loaded with `load_all`, because they will have a different path.