homebrewを更新しようとしたら詰まったのとその解決法

大したことではないがメモしておく

berlysia:> brew update
Warning: Could not tap homebrew/dupes/ant over mxcl/master/ant
Warning: Could not tap homebrew/dupes/cvs over mxcl/master/cvs
Error: undefined method `to_sym' for nil:NilClass
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/troubleshooting
/usr/local/Library/Homebrew/cmd/update.rb:123:in `report'
/usr/local/Library/Homebrew/cmd/update.rb:121:in `each_line'
/usr/local/Library/Homebrew/cmd/update.rb:121:in `report'
/usr/local/Library/Homebrew/cmd/update.rb:35:in `update'
/usr/local/Library/brew.rb:95:in `send'
/usr/local/Library/brew.rb:95

Homebrew, Ruby, and Git - RayHightower.com ここを見つけたので

berlysia:> rbenv versions
  system
* 2.0.0-p247 (set by /Users/berlysia/.rbenv/version)

berlysia:> rbenv local system

berlysia:> rbenv versions
* system (set by /Users/berlysia/.ruby-version)
  2.0.0-p247

berlysia:> brew update
Updated Homebrew from 44988d34 to 44988d34.
==> Updated Formulae
homebrew/dupes/apr	      homebrew/dupes/file-formula   homebrew/dupes/grep		  homebrew/dupes/openssh	homebrew/dupes/tidy
homebrew/dupes/apr-util	      homebrew/dupes/gdb	    homebrew/dupes/httpd	  homebrew/dupes/tcl-tk		homebrew/dupes/zlib
==> Deleted Formulae
homebrew/dupes/ant  homebrew/dupes/cvs

無事更新できましたとさ。