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-rw-r--r--compiler/GHC/Tc/Types/Constraint.hs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/GHC/Tc/Types/Constraint.hs b/compiler/GHC/Tc/Types/Constraint.hs
index bf594637a9..719bf4ca95 100644
--- a/compiler/GHC/Tc/Types/Constraint.hs
+++ b/compiler/GHC/Tc/Types/Constraint.hs
@@ -1751,6 +1751,9 @@ half of the split to rewrite the second D, and off we go. This splitting
would allow the split-off R equality to be rewritten by other equalities,
thus avoiding the problem in Note [Why R2?] in GHC.Tc.Solver.Monad.
+This infelicity is #19665 and tested in typecheck/should_compile/T19665
+(marked as expect_broken).
+
-}
eqCanRewrite :: EqRel -> EqRel -> Bool