class Gem::Specification

def check_version_conflict other # :nodoc:
  return if self.version == other.version
  # This gem is already loaded.  If the currently loaded gem is not in the
  # list of candidate gems, then we have a version conflict.
  msg = "can't activate #{full_name}, already activated #{other.full_name}"
  e = Gem::LoadError.new msg
  e.name = self.name
  # TODO: e.requirement = dep.requirement
  raise e
end