From: Daniel Sheppard <daniels@...>
Date: 2005-10-26T10:55:14+09:00
Subject: Bug with Nils in YAML

I can't find much reference to this anywhere, except a discussion on
ruby-core that I wasn't sure was related.

The version of YAML that I've got can't handle this:

YAML::load({nil=>'x'}.to_yaml)

ArgumentError: parse error on line 1, col 1: `: x'
        from e:/Development/Ruby/lib/ruby/1.8/yaml.rb:119:in `load'
        from e:/Development/Ruby/lib/ruby/1.8/yaml.rb:119:in `load'
        from (irb):5

also:

p YAML::load("--- \n~").to_yaml
=> "--- "



> ruby -v
ruby 1.8.2 (2004-12-25) [i386-mswin32]

The source code for my NilClass#to_yaml differs from that displayed at
ruby-doc, so maybe the newer version fixes it, this seems to do it:

class NilClass 
  def to_yaml( opts = {} )
    opts[:KeepValue] = true
    "~".to_yaml( opts )
  end
end

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