Rename failed in Xcode 9 : <p>I used "renamed" function to rename a variable named "DefaultRequestURL" in Xcode 9, it alert this:
<a href="https://i.stack.imgur.com/iPgPk.jpg" rel="noreferrer">alert image</a>
I have checked the file "ComposeController.swift", there is no "DefaultRequestURL"。
I have restart Xcode and do "Product -> Clean", it still failed.</p>

<p>why this? What should I do?</p>
