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-rw-r--r--src/NormalForm.idr3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/NormalForm.idr b/src/NormalForm.idr
index f4697f5..ea3b2c0 100644
--- a/src/NormalForm.idr
+++ b/src/NormalForm.idr
@@ -36,6 +36,9 @@ record Normal (ctx : SnocList Ty) (ty : Ty) where
-- Inversions ------------------------------------------------------------------
export
+Uninhabited (IsNormal (Sub t sub)) where uninhabited (Ntrl prf) impossible
+
+export
predNorm : IsNormal (Succ t) -> IsNormal t
predNorm (Succ prf) = prf