Hamish Knight 78072de623 [CS] Assert that we don't end up with unsolved constraints ...

Make sure we don't end up in a situation where we
have unsolved constraints left over and consider
the system fully solved.

This requires tweaking the type matching code for
dependent members such that a concrete base is
considered a failure rather than being left
unsolved. This should only happen when not in
diagnostic mode, as otherwise we use a hole.

2020-04-10 10:16:08 -07:00

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