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austinzheng/existential_opening.swift

Last active May 22, 2016 07:30
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existential_opening.swift
func compare(a: Any, b: Any) -> Bool {
if let a = a as? Equatable, a openas T {
if let b = b as? Equatable, b openas T {
return a == b
}
}
fatalError("a and b aren't comparable")
}
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