First of all you need to Ruby 1.9, and then 
class Proc; def -@; self; end; end


Try: 
p = ------------------> x{x + 1}
p[1]


have fun.

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There is a more comfortable way:
gem install superators

Jay Phillips wrote 

require 'superators'
class Array
  superator "<-----------------" do |operand|
    self << operand.reverse
  end
end
[1,2,3] <----------------- [1,2,3]
#=> [1,2,3,3,2,1]


Attention, and the above is different from one more or less minus the establishment of a not Oh.

Jay Phillips is another killer Rails application after the author of Adhearson.