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-rw-r--r--src/Soat/Data/Product.idr4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/Soat/Data/Product.idr b/src/Soat/Data/Product.idr
index e9c3d17..52f9181 100644
--- a/src/Soat/Data/Product.idr
+++ b/src/Soat/Data/Product.idr
@@ -63,8 +63,8 @@ indexTabulate f (There elem) = indexTabulate (f . There) elem
public export
map : (f : (i : a) -> x i -> y i) -> {is : List a} -> x ^ is -> y ^ is
-map f [] = []
-map f (x :: xs) = f _ x :: map f xs
+map f {is = []} xs = []
+map f {is = (i :: is)} xs = f _ (head xs) :: map f (tail xs)
public export
(++) : x ^ is -> x ^ js -> x ^ (is ++ js)