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jspahrsummers/gist:cb9ae22c0fd0da0d539b

Last active August 29, 2015 14:03
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Covariance + generics = 😢
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gistfile1.swift
class Stream<T> {
// But I want `Stream<U>` to instead be typed as whatever subclass this is invoked upon
func map<U>(f: T -> U) -> Stream<U>
}
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