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-rw-r--r--src/CHAD/Drev.hs3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/CHAD/Drev.hs b/src/CHAD/Drev.hs
index bfa964b..ee92782 100644
--- a/src/CHAD/Drev.hs
+++ b/src/CHAD/Drev.hs
@@ -1009,11 +1009,10 @@ drev des accumMap sd = \case
let smallE = unsafeWeakenWithSubenv usedSub e in
subDescr des usedSub $ \usedDes subMergeUsed subAccumUsed subD1eUsed ->
case drev usedDes (VarMap.subMap subAccumUsed accumMap) sd smallE of { Ret e0 subtape _ sub e2 ->
- let subMergeUsed' = subenvMap (\t Refl -> spDense t) (d2eM (select SMerge des)) (subenvD2E subMergeUsed) in
Ret (collectBindings (desD1E des) subD1eUsed)
(subenvAll (desD1E usedDes))
(weakenExpr (wSinks (desD1E usedDes)) $ drevPrimal des e)
- (subenvCompose subMergeUsed' sub)
+ (subenvCompose (subenvD2E subMergeUsed) sub)
(letBinds (fst (weakenBindingsE (WSink .> wRaiseAbove (desD1E usedDes) (d2ace (select SAccum des))) e0)) $
weakenExpr
(autoWeak (#d (auto1 @sd)