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<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

<div id="app">35345</div>

<script>
  var mixin = {
  template: '<div>test<slot></slot></div>'
};

var $v = new Vue({
  el:'#app',
  mixins:[mixin],
  created() {
    this.$slots.default = '12'
  }
});
</script>