I like the bar `|` variation, but I do think the control value should be out
front, otherwise the ? reads as an optional to my mind, whereas the former
comes across as the beginning of a ternary (which this is effectively an
extension of). The bar variation feels Haskell-y in a satisfying way,
You're right Charles, the confusion with the OR operator is something I
neglected to mention (despite noticing it) because of my own preference.
However, I would like some kind of explicit separator between cases. If we're
unwilling to reuse the `case` keyword, I hope commas will be enforced.
Slight tangent, would a guarantee of purity also allow for more Tail-Call
Optimizations? A cursory glance at SO seems to point to TCO not always being
applied, especially when ARC is involved.
On Dec 21 2015, at 1:55 pm, Joe Groff via swift-evolution swift-
evolut...@swift.org wrote:
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