a = ->(x) { x + 1 }
b = ->(x) { x * 10 }
c = ->(x) { b.( a.( x ) ) }

class Proc
  def *(other)
    ->(*args) { self[*other[*args]] }
  end
end

a = ->(x){x+1}
b = ->(x){x*10}
c = b*a
c.call(1) #=> 20