def or_(task1, task2) do
      parent = self
      pid1 = spawn(fn -> send parent, task1.() end)
      pid2 = spawn(fn -> send parent, task2.() end)
      receive do
        false ->
          receive do
            result2 -> 
              Process.exit pid1, :kill
              Process.exit pid2, :kill
              result2
          end
        true -> 
          Process.exit pid1, :kill
          Process.exit pid2, :kill
          true
      end
    end