hashblock.rb

# What is it with you people and your singletons?

class Hash
  def self.from_block(&block)
    Hash[*BlockBuilder.new(&block).collected]
  end
  
  class BlockBuilder
    attr_reader :collected

    def initialize(&block)
      @collected = []
      instance_eval(&block)
    end

    def method_missing(method, *args)
      @collected << method.to_sym << args.first
    end
  end
end

p Hash.from_block { apple 8; banana 2; carrot 6 }
# prints {:apple=>8, :banana=>2, :carrot=>6}