Implement let-values #33
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This is a rather large change because to implement let-values, we fixed a couple of things along the way. * `define-values` should not create a new environment. Just adds to the current one. * as a consequence of the previous point, we need to add an empty env at interpreter construction time. * implement a downcast function from expr to value as that is needed around a few places. * add more implementations for dumper. Fixes #7
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This is a rather large change because to implement let-values, we fixed a couple of things along the way.
define-valuesshould not create a new environment. Just adds to the current one.Fixes #7