twitter/commons — pull request #120 by ryan-williams (2013-02-22 19:58:20+00:00)
Title: Default scala_library sources to globs('*.scala')

The current default (no sources) doesn't make much sense (such
a library should just be declared as a dependencies() wrapper).

globs('*.scala') contributes to a clean 1:1:1 relationship
between targets, packages, and directories.