Function markRef

lib/assets/react-source/development/react.js:20693–20700

(current, workInProgress)

	}

	function markRef(current, workInProgress) {
	  var ref = workInProgress.ref;

	  if (current === null && ref !== null || current !== null && current.ref !== ref) {
	    // Schedule a Ref effect
	    workInProgress.effectTag |= Ref;
	  }
	}

	function updateFunctionComponent(current, workInProgress, Component, nextProps, renderExpirationTime) {
	  {