align name-based pattern matching with dotty

[adriaanm]

[dwijnand]

What are the highlights?

[smarter]

We've had to make dotty's implementation fairly close to scalac's for compatibility reasons, but I think product patterns at least are new: http://dotty.epfl.ch/docs/reference/changed/pattern-matching.html (they're mostly useful to pattern match on case classes without boxing, scalac achieves that by special-casing pattern matching on case classes)

[dwijnand]

I see. That looks like a cool feature.