From the comp.lang.ruby list:

On Aug 4, 2008, at 08:28 AM, matt neuburg (that's me) wrote:

I am really just not having any luck with rdoc / ri these days. Because the new version of rdoc promised that File#read would finally succeed (automatic lookup of methods in the supercclass), I downloaded it. It didn't change anything so I rebuilt my documentation from scratch. Now fast-ri is broken. Can anyone divine from this error what's gone wrong and what I should do? Thx - m.

$ qri String /usr/local/lib/ruby/1.8/yaml.rb:133:in `transfer': invalid subclass (TypeError) from /usr/local/lib/ruby/1.8/yaml.rb:133:in `node_import' from /usr/local/lib/ruby/1.8/yaml.rb:133:in `load' from /usr/local/lib/ruby/1.8/yaml.rb:133:in `load' from /usr/local/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:72:in `deserialize'

[Reply from Eric Hodel]

Looks like qri is using RDoc 1.0.1, which is shipped with ruby. RDoc 2's on-disk YAML format is not backwards compatible with RDoc 1. RDoc 2 can read RDoc 1's format due to some use of regular expressions. fast-ri would need to be updated to read the RDoc 2 classes.

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So, if Eric is right, then fastri needs to be updated to understand the current yaml format generated by current versions of rdoc...

The problem for TextMate / RubyMate is that its Help uses qri, which is fastri. In fact, that is how I discovered the problem. I installed the new rdoc, regenerated my help files, and found that Help in RubyMate had stopped working, with the above error.

Just letting y'all know... m.