This is not an issue with readline itself, but impacts uses of it via gopkg. See niemeyer/gopkg#9 for details.

Basically, gopkg only works correctly with single-package repositories. Because gopokg.in/chzyer/readline.v1 imports github.com/chzyer/readline/runes, both repositories will be pulled in, but the latter be at HEAD on master.

I don't have a solution to this unfortunately, I just noticed it when pulling in readline via otto.