cached rdoc diagrams, private rdoc comments, minor clarifications in debug.rb and pp.rb

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10491 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/pp.rb b/lib/pp.rb
index 266949e22b..bc61484148 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -318,7 +318,7 @@ class PP < PrettyPrint
     # implement #pretty_print, or a RuntimeError will be raised.
     def pretty_print_inspect
       if /\(PP::ObjectMixin\)#/ =~ method(:pretty_print).inspect
-        raise "pretty_print is not overridden."
+        raise "pretty_print is not overridden for #{self.class}"
       end
       PP.singleline_pp(self, '')
     end