Attempting to install RubyGems onto Ruby 1.9.2 (in my case - installer
for Windows) as the RoR download page suggests causes the following
very non-informative error:
source_index.rb:68:in `installed_spec_directories': undefined method
`path' for Gem:Module (NoMethodError)
Apparently Ruby 1.9.2 (at least the installer for Windows) comes with
RubyGems bundled. Just FYI for RoR webmasters & fellow newbies such as
myself that don't keep track of Ruby's new features.