Xcode-beta (7A176x): Unclear compiler error 'String' is not convertible to 'StringLiteralConvertible'

Originator:dieter.komendera
Number:rdar://22282357 Date Originated:14-Aug-2015 06:24 AM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-beta (7A176x)
Classification:UI/Usability Reproducible:Always
 
Summary:
This produces an error which doesn’t match what’s actually wrong:

let settingsButton = UIButton(.type: .Custom)
NSLayoutConstraint.constraintsWithVisualFormat("", options: nil, metrics: nil, views: ["settingsButton": settingsButton])

produces ’String' is not convertible to 'StringLiteralConvertible'

The actual error is that nil is passed for options, where [] should be passed.

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