I Can\'t run Spring. Here is the error log.
myid-no-MacBook-Pro:myid$ spring
/Users/myid/.rbenv/versions/1.9.3-p484/lib/ruby/gems/1.9.1/gems/spring-0.0.10/li
This problem appears to be limited to a range of Ruby 1.9.3 patch levels, compiled on a Mac, using the Apple supplied compiler.
I have a couple of later patches of Ruby (2.0, 2.1.2) at latest stable, LLVM. They work.
So, at some point in the 1.9.3 series, after p125, Spring stops working when using LLVM. At some point, at least 2.0.0-p481, later Ruby versions and minor versions, and tiny versions, start working again, with LLVM. IOW, this looks like a Ruby 1.9.3 regression issue, possibly a Ruby 2.0.0 regression issue. I've documented what I've found on Github as a Spring issue.
Right now, if you need 1.9.3 and you need Spring on a Mac... consider Zeus. ;)