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-rw-r--r--src/CHAD/Drev/Types/ToTan.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/CHAD/Drev/Types/ToTan.hs b/src/CHAD/Drev/Types/ToTan.hs
index 019119c..51403f5 100644
--- a/src/CHAD/Drev/Types/ToTan.hs
+++ b/src/CHAD/Drev/Types/ToTan.hs
@@ -41,3 +41,4 @@ toTan typ primal der = case typ of
STScal sty -> case sty of
STI32 -> der ; STI64 -> der ; STF32 -> der ; STF64 -> der ; STBool -> der
STAccum{} -> error "Accumulators not allowed in input program"
+ STUser{} -> error "User types not yet supported in forward AD"