Commit 09bf135a authored by Committed by Ben Gamari
Fix #13333 by fixing the covar's type in ctEvCoercion
The change is noted in Note [Given in ctEvCoercion]. This patch also adds a bit more commentary to TcFlatten, documenting some key invariants of the flattening algorithm. While in the area, I also removed some stale commentary from TcCanonical.
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