I've just put on gemcutter new versions of the Ruby debugger trepanning.
This in turn uses rb-threadframe and rb-trace. See
https://github.com/rocky/rb-trepanning/wiki

A little history. ruby-debug got more and more convoluted over the years
and part of the problem was and still is a lack of run-time support for
debugger things. Sometime in the Ruby 1.9.1-1.9.2 time frame I started
experimenting with beefing up the run-time support in Ruby for things
like debuggers. In particular, I added a call-frame object, run-time
support for setting breakpoints and a number of other things like this.
https://github.com/rocky/rb-threadframe/tree/master/patches/1.9.3 has
the detailed list of changes.

In MRI 1.9.2, I tried as much as possible to do these things as a C
extension. However with 1.9.3 this was no longer tenable since even
fewer functions and variables are exposed. So in 1.9.3 more of these
changes are moved into a patched MRI 1.9.3.

I've built this on Linux and cygwin. Sorry, I don't have OSX to try it
on. Since this is sort of new stuff, if you are a novice you might
consider waiting a bit.

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