Refactor Ct and friends
Right now, the Ct type contains many constructors. This ticket tracks breaking up this type into smaller ones. Candidates:
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All constraints are born as non-canonical. So the bag of constraints in the
TcMmonad are all non-canonical. This should be its own type. -
Equality constraints are dealt with separately from others. (See details on the description of the inert set.) These should be their own types, too.
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A work list has both canonical and non-canonical constraints. But this might be the only place we need the full sum.