Improve CopyStep's error message. Summary: I saw this while developing, and I was not sure what was attempted to be copied. Test Plan: Sandcastle builds.
Buck is an Android build tool. To see what Buck can do for you, check out the documentation at http://facebook.github.io/buck/.
To build Buck, run the following:
git clone git@github.com:facebook/buck.git cd buck ant ./bin/buck --help
Apache License 2.0