From: Trans Date: 2006-08-08T19:25:10+09:00 Subject: File.join : can't convert Fixnum into String ? Where's the Fixnum? class X < Array def to_s join('.') end def inspect ; to_s ; end end x=X.new x << 1 x << 2 x << 3 x #=> 1.2.3 x.class #=> X File.join( x, 'index.rb' ) TypeError: can't convert Fixnum into String from (irb):19:in `join' from (irb):19 from :0