[swift-users] Using ... as a concrete type conforming to protocol ... is not supported

Jason Sadler jason.sadler at gmail.com
Fri Apr 1 13:36:48 CDT 2016

It turns out you can use an equality type constraint instead of a conformance type constraint:

extension CollectionType where Generator.Element == AnyEquatable {
    func indexOf(element : AnyEquatable) -> Index? {
        return indexOf({ (currentElement : Generator.Element ) -> Bool in

Discussion is ongoing at swift-evolution: https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160328/013922.html
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