After upgrading to 1.8.4 using one-click, ri isn't working for some
items:

C:\Documents and Settings\gavin.kistner>ri Array
C:/ruby/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in `concat': can't
convert nil into Array (TypeError)
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in
`merge_in'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_reader.rb:56:in
`get_class'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_reader.rb:52:in
`get_class'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:70:in
`report_class_stuff'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:106:in
`get_info_for'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:135:in
`process_args'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:134:in
`process_args'
        from C:/ruby/bin/ri.bat:55

C:\Documents and Settings\gavin.kistner>ri Array#concat
-----------------------------------------------------------
Array#concat
     array.concat(other_array)   ->  array
------------------------------------------------------------------------
     Appends the elements in other_array to _self_.

        [ "a", "b" ].concat( ["c", "d"] ) #=> [ "a", "b", "c", "d" ]

C:\Documents and Settings\gavin.kistner>ri --version
ri v1.0.1 - 20041108

C:\Documents and Settings\gavin.kistner>ruby --version
ruby 1.8.4 (2006-04-14) [i386-mswin32]

I found two other references to this in the nntp archive, but no
followup responses. Using fxri for Array or String causes fxri to crash
(unsurprisingly).

I tried regenerating my system-wide ri data, to no avail:

C:\ruby\src\ruby-1.8.4>rdoc -R
                            array.c:
c........................................................................
                           bignum.c: c............................
[snip]
Generating RI...

Files:   83
Classes: 198
Modules: 66
Methods: 2187
Elapsed: 126.922s

C:\ruby\src\ruby-1.8.4>ri Array
C:/ruby/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in `concat': can't
convert nil into Array (TypeError)
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_descriptions.rb:99:in
`merge_in'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_reader.rb:56:in
`get_class'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_reader.rb:52:in
`get_class'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:70:in
`report_class_stuff'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:106:in
`get_info_for'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:135:in
`process_args'
        from C:/ruby/lib/ruby/1.8/rdoc/ri/ri_driver.rb:134:in
`process_args'
        from C:/ruby/bin/ri.bat:55


Anyone got any groovier suggestions?