TODO.
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TODO.md
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that would require multiple name transformations (i.e., composing multiple
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environment lookups).
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* Can `let0`, `let1`, and `letn` be simplified or combined? Do we really need
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a `CLet` form that binds several names at once? Can the treatment of
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unreachable type variables be simplified?
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* Can we remove the redundancy between `instance` and `instance_? (See next item.)
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* Introduce a combinator `ignore : 'a co -> unit co` that allows the solver to
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elaboration. Also, it could remove the need for a primitive `instance_`
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combinator, as `instance_ x ty` would correspond to `ignore (instance x ty)`.
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* Introduce a `forall` combinator so as to make it easy to express `∀α.c`.
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## Error Handling
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* Attach exploitable information to the exception `VariableScopeEscape`.
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decoding is performed either during elaboration or after the
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unifier has encountered an error.
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* Improve the documentation produced by `make doc`.
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* Document the requirement that the function passed to `map` must be pure.
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Use this hypothesis to remove the useless evaluation of `k1 env` in the
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definition of `^^`.
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## Test Suite
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* Improve the coverage of the test suite. Add explicit negative test cases.
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