I'm only getting the first line of this warning:
DEPRECATION WARNING: Using Module#delegate to delegate to non-public methods is . (called from ...
Also, the line number is incorrect. (added in aa1d1e4)
Fix non-public method warning in Module#delegate. Fixes #2548.
Thanks for reporting! It looks like using the multi-line string syntax in combination with the comments at the end of the lines was problematic.
@jonleighton There seems to be another issue with this warning: #2614