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-rw-r--r--backends/lean/Base/Arith/Arith.lean3
1 files changed, 0 insertions, 3 deletions
diff --git a/backends/lean/Base/Arith/Arith.lean b/backends/lean/Base/Arith/Arith.lean
index 8bfad6ae..da263e86 100644
--- a/backends/lean/Base/Arith/Arith.lean
+++ b/backends/lean/Base/Arith/Arith.lean
@@ -16,9 +16,6 @@ namespace Arith
open Primitives Utils
-- TODO: move
-instance Vec.cast (a : Type): Coe (Vec a) (List a) where coe := λ v => v.val
-
--- TODO: move
/- Remark: we can't write the following instance because of restrictions about
the type class parameters (`ty` doesn't appear in the return type, which is
forbidden):