         end
       end
 
-      Hygiene.return_length #=> 3
+      Hygiene.return_length()
+      #=> 3
 
   Notice how `Hygiene.return_length/0` returns `3` even though the `Kernel.length/1`
   function is not imported. In fact, even if `return_length/0`

        end
      end

      ContextHygiene.write
      ContextHygiene.read
      #=> 1

  ## Hygiene in aliases

        end
      end

      Hygiene.write()
      Hygiene.read()
      #=> ** (RuntimeError) undefined variable a or undefined function a/0

  For such, you can explicitly pass the current module scope as
