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- unexpected effects - missing effects when a skolem fails to unify
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These two errors have often come up when I'm writing code, and when there's a lot of effect types it takes a while of scanning the list to figure out the offending effect.
I'm fairly confident about the unexpected effects code path, but the missing effects (and corresponding hint message) was implemented based on finding the codepath I observed for this particular error, rather than a solid understanding of type theory 😅.