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Update XXXX-enhanced-existentials.md #3

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Update XXXX-enhanced-existentials.md #3

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2 changes: 1 addition & 1 deletion proposals/XXXX-enhanced-existentials.md
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Expand Up @@ -658,7 +658,7 @@ Here is an example of how `as?` casting can be used to do 'useful' work at runti

```swift
// Set the first element of a string or integer collection to some value.
func setFirstElement(collection: Collection, theInt: Int, theString: String) -> Bool {
func setFirstElement(collection: Collection, theInt: Int, theString: String) where Collection : class -> Bool {
guard !collection.isEmpty else { return false }

if let intCollection = collection as? Collection where .Element == Int {
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