Smalltalk, Go, Erlang, ...https://twitter.com/pcwalton/status/857677705738727424 …
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Strongtalk types are structural and optional. That makes a big difference in the experience. Patterns + optional analysis tools also useful.
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The solution in Go is interfaces plus optional analysis tools. Also keeping the language simpler and experience more immediate.
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For the record: When I say "sum" I specifically mean type w/ exhaustive membership of disjoint cases, mutually exclusive between types.
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By contrast, I rather default to open membership, offer matching constructs that support overlap, and permit reusing ctors across types.
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