         use Mix.Task
 
         def run(_) do
-          Mix.shell.info "hello"
+          Mix.shell().info("hello")
         end
       end
 

  append new compilers to Mix:

      def project do
        [compilers: Mix.compilers ++ [:foo, :bar]]
      end

  """

        end

        defp hello(_) do
          Mix.shell().info("Hello world")
        end
      end

