<p dir="auto">I create some dynamic components with a sample router, but  when I change the currentView value to render the component, there are some warn message print like:<br>
<code class="notranslate">Data field "xxx" is already defined as a prop. Use prop default value instead.</code><br>
obviously, I passed the parent data by <code class="notranslate">props</code></p>
<p dir="auto">with Vue.js 1.0.0-alpha.8</p>
<h3 dir="auto">Version</h3>
<p dir="auto">2.6.11</p>
<h3 dir="auto">Reproduction link</h3>
<p dir="auto"><a href="https://jsfiddle.net/dpcmr1tz/" rel="nofollow">https://jsfiddle.net/dpcmr1tz/</a></p>
<h3 dir="auto">Steps to reproduce</h3>
<p dir="auto">I can not using syntax babel in vue file, it error by vue-template-compile</p>
<h3 dir="auto">What is expected?</h3>
<p dir="auto">I hope to can using syntax babel 7 like example: message?.name, with "message" is a object</p>
<h3 dir="auto">What is actually happening?</h3>
<p dir="auto">I can not using syntax babel in vue file, it error by vue-template-compile</p>