requiring library via library

[trans]

This is a bit esoteric but, if one is working on Library project itself such that is it is in the RUBYLIBS paths, requiring library again can cause a stack overflow.

Example of issue:

  $ gem install library
  $ export RUBYOPT="-rubylibs"
  $ export RUBYLIBS="~/workspace/library/"
  $ irb
  $ require 'library'

The reason is b/c the first RUBYOPT require is getting it form the gem, but the second is getting it from the workspace project.