Also hoping someone more knowledgeable can explain why these seemingly
simple cases do in fact take so long! :)
Matt Gallagher wrote an excellent article where he explained how
seemingly simple expressions can sometimes cause an enormous amount of
work for the type checker because it has so many overloads to consider:
"Exponential time complexity in the Swift type checker"
http://www.cocoawithlove.com/blog/2016/07/12/type-checker-issues.html
It's a great read.
For what it's worth, on my Mac with Xcode 8b6 the snippet takes about 3
seconds to compile (which is still a long time).
Ole
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