Implement default instances of typeclasses. #56
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Comma expressions shall be dead from this point onwards.
This way the code in default_instance_expression can just become a function, and we have one AST node kind less to worry about.
…resentation. Start building the instance selector functions.
There's a few minor refactors in this commit as well, like finally making builtin_types return things that don't need unwrapping with get, but the title line is the soul of the changes. Name handling is now done top-down, not bottom-up; every layer knows its _full_ name as soon as it is possible. This simplified scope handling, removed the need for scope generators, and enabled default instances. Generally a lot of things are now how they should've been from the start. Anyway, it's now possible to import a default instance. Nice. Only... a... year? in the works.
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