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-rw-r--r--src/CHAD/ForwardAD/DualNumbers/Types.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/CHAD/ForwardAD/DualNumbers/Types.hs b/src/CHAD/ForwardAD/DualNumbers/Types.hs
index 5d5dd9e..6dcef1c 100644
--- a/src/CHAD/ForwardAD/DualNumbers/Types.hs
+++ b/src/CHAD/ForwardAD/DualNumbers/Types.hs
@@ -42,6 +42,7 @@ dn (STScal t) = case t of
STI64 -> STScal STI64
STBool -> STScal STBool
dn STAccum{} = error "Accum in source program"
+dn STUser{} = error "User types not yet supported in forward AD"
dne :: SList STy env -> SList STy (DNE env)
dne SNil = SNil