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-rw-r--r--transfer/examples/stoneage.tr3
1 files changed, 3 insertions, 0 deletions
diff --git a/transfer/examples/stoneage.tr b/transfer/examples/stoneage.tr
index 3a4b5393b..e48c519e6 100644
--- a/transfer/examples/stoneage.tr
+++ b/transfer/examples/stoneage.tr
@@ -1,3 +1,5 @@
+import prelude
+
data Cat : Type where {
CN : Cat ;
NP : Cat ;
@@ -205,3 +207,4 @@ data Tree : (_ : Cat)-> Type where {
derive Compos Tree
+derive Eq Tree \ No newline at end of file