Thanks to @huitseeker for the answer, but the fact that `for ((_,_)<-List(1->2))()` needs a filter still seems crazy: http://stackoverflow.com/a/17427067/334519 …
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@dibblego@d6@huitseeker@travisbrown because the semantics is not clear? didn't know `for` was so controversial
@eed3si9n @d6 @huitseeker @travisbrown #scala for-comprehensions get a lot of little things wrong that usually sum up to give you a bad day
