gistfile1.rb

class ConstHash < Hash
	def []=(name, value)
		if has_key? name
			raise "Can't rebind #{name}"
		else
			super name, value
		end
	end
end

class Const
	@@dict = {}
	def self.method_missing(name, *args)
		if name.to_s =~ /=$/
			name = name.to_s.chop!
			if !@@dict.has_key?(name)
				@@dict[name] = args.first
			else
				raise "Can't rebind #{name}"
			end
		else
			@@dict[name.to_s]
		end
	end
end


Const.magic = 23
# Const.magic = 88

const = ConstHash.new
const['wtf'] = 23
const['wtf'] = 88