Open Radar

 
Summary:
A very simple code sample consistently gives a "Refactoring engine ranges didn't match initial ranges" error when trying to refactor in Xcode 9.

Steps to Reproduce:
Create a new command line Mac project in Xcode. Put the following code in the main.swift file...

~~~
    import Foundation 

    guard let x = "z" as String? else { exit(1) }
    let y = x.data(using: .utf8)
~~~

Right click on the `x` in the last line and select "Rename...."

Expected Results:
Both instances of `x` should appear in the refactoring user-interface.

Observed Results:
The editor continually tries to select the entire `x.data` text, instead of easily selecting `x`. A few attempts may be required. I don't know if this is a related problem or a bug for another time.

An alert sheet with the message "Refactoring engine ranges didn't match initial ranges" appears and refactoring is not possible.

If the x on the `guard` line is selected, refactoring is offered but the `x` on the next line does not appear.