text: System.register([], function () {
  	'use strict';
  	return {
  		execute: function () {
  
  			var effect1 = () => console.log( 'effect' ); // must not be removed!
  			function isKept1 ( x = effect1 ) {
  				x();
  			}
  			isKept1();
  
  			var effect2 = () => console.log( 'effect' ); // must not be removed!
  			var isKept2 = function ( x = effect2 ) {
  				x();
  			};
  			isKept2();
  
  			var effect3 = () => console.log( 'effect' ); // must not be removed!
  			var isKept3 = ( x = effect3 ) => {
  				x();
  			};
  			isKept3();
  
  		}
  	};
  });
  