Function pop

code/new-context-api/public/app.js:11937–11960

(cursor, fiber)

  }

  function pop(cursor, fiber) {
    if (index < 0) {
      {
        warning(false, 'Unexpected pop.');
      }
      return;
    }

    {
      if (fiber !== fiberStack[index]) {
        warning(false, 'Unexpected Fiber popped.');
      }
    }

    cursor.current = valueStack[index];

    valueStack[index] = null;

    {
      fiberStack[index] = null;
    }

    index--;
  }

  function push(cursor, value, fiber) {
    index++;