This actually appears to work on 9k and not on 1.7. Notice in your log that the bacon.rb warning is coming from a 1.7.18-d19 install in rvm.

However, I can't reproduce it on either 9k or 1.7 on OS X. It may be specific to Linux.

@raggi Are you on Linux? If so, can you try running there with both versions and report back?

I haven't replicated this locally (I'm keeping my rack time minimal these days, as I have absolutely no use for it (or ruby) anymore). It's occurring on travis.

So it is. Eugh, travis.

It is specific to Linux or specific to Travis?

Sorry, I'm shaving yaks right now (bundler, travis, optional dependencies, platforms). I'll have some better answers for you in maybe 20 minutes.

Yes, it's 1.7.18 on linux that's failing. My apologies for the confusion.

It passes on 1.7.9 on OSX. Installing 1.7.18 on OSX now.

Confirm, it passes on OSX.

@raggi Ok, thank you for confirming. I think we can take it from here.

@raggi I tried to reproduce the issue on current master - I could not reproduce it with jruby-1.7.19 or jruby-9.0.0.0-pre1 and rack on travis seems to be green now.

would like either to fix the problem or close this issue

Feel free to close