# File yaml/types.rb, line 129
        def self.[]( *vals )
            p = Pairs.new
            0.step( vals.length - 1, 2 ) { |i|
                p[vals[i]] = vals[i+1]
            }
            p
        end

# File yaml/types.rb, line 136
        def []( k )
            self.assoc( k ).to_a
        end

# File yaml/types.rb, line 139
        def []=( k, val )
            self << [ k, val ] 
            val
        end

# File yaml/types.rb, line 143
        def has_key?( k )
            self.assoc( k ) ? true : false
        end

# File yaml/types.rb, line 146
        def is_complex_yaml?
            true
        end

# File yaml/types.rb, line 149
        def to_yaml( opts = {} )
            YAML::quick_emit( self.object_id, opts ) { |out|
                out.seq( "!pairs" ) { |seq|
                    self.each { |v|
                        seq.add( Hash[ *v ] )
                    }
                }
            }
        end