On Mon, Jan 8, 2018 at 11:53 PM, Xiaodi Wu via swift-evolution < swift-evolution@swift.org> wrote:
> Thank you for the clarification. It occurred to me in the shower that this > might be the case, and that I was entirely mistaken as to what we were > talking about. > > Yes, then, I wholeheartedly agree on this point. Out of curiosity, why are > there source stability issues to 'typealias DictionaryLiteral<Key, Value> = > [(Key, Value)]'? Because at the point of use, “DictionaryLiteral” is instantiated with an actual dictionary literal, eg. “[a: 1, b: 2, c: 3]”, and that syntax isn’t available for an array of key-value pairs. As near as I can tell, the convenience of that spelling is the entire *raison-d’être* for “DictionaryLiteral” in the first place. The ulterior question of whether preserving “DictionaryLiteral” is worthwhile, is apparently out of scope. Personally, I have a hard time imagining a compelling use-case outside of the standard library, and I doubt it’s being used “in the wild” (I checked several projects in the source-compatibility suite and found zero occurrences). Nevin
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