Fix-it cannot tell apart multiple instances of the same identifier in the same line

Originator:an00na
Number:rdar://31328491 Date Originated:29-Mar-2017 03:17 PM
Status:Open Resolved:
Product:Developer Tools Product Version:8.3
Classification:Other Bug Reproducible:Always
 
Summary:
For the following line of code it will endlessly fix the 1st instance of kCTFontNameAttribute by endlessly casting it to String while the real issue remaining is the 2nd instance of kCTFontNameAttribute needing casting.

UIFontDescriptor(fontAttributes: [(kCTFontNameAttribute as String) as String: "AppleColorEmoji"]).matchingFontDescriptors(withMandatoryKeys: [kCTFontNameAttribute])

--- Update ---

Wait, even after I manually fit it by casting the 2nd kCTFontNameAttribute to String Xcode still insist that " 'String' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?". So the issue is deeper that I originally thought. Since I cannot come up with a proper title I'll leave the original title here.

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Steps to Reproduce:
1. Run sample playground.
2. Follow Fix-it.

Code: https://cloudup.com/cTYyQ0GPtyC

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