/usr/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in `concat': can't
convert nil into Array (TypeError)
from /usr/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in
`merge_in'
from /usr/lib/ruby/1.8/rdoc/ri/ri_reader.rb:56:in `get_class'
from /usr/lib/ruby/1.8/rdoc/ri/ri_reader.rb:52:in `get_class'
from /usr/lib/ruby/1.8/rdoc/ri/ri_driver.rb:70:in
`report_class_stuff'
from /usr/lib/ruby/1.8/rdoc/ri/ri_driver.rb:106:in
`get_info_for'
from /usr/lib/ruby/1.8/rdoc/ri/ri_driver.rb:135:in
`process_args'
from /usr/lib/ruby/1.8/rdoc/ri/ri_driver.rb:134:in
`process_args'
from /usr/bin/gemri:24
If you're using ruby 1.8.5 (and possibly 1.8.4) you can just ignore
gemri.
How? ri does not find the docs to gems.
Lies. (Unless you're using ruby 1.8.5.)
$ ri ZenTest
--------------------------------------------------------- Class: ZenTest
ZenTest scans your target and unit-test code and writes your
missing code based on simple naming rules, enabling XP at a much
quicker pace. ZenTest only works with Ruby and Test::Unit.