1 files changed, 2 insertions, 0 deletions
diff --git a/src/prim.sig b/src/prim.sig
index 6861ec8a..e443e515 100644
--- a/src/prim.sig
+++ b/src/prim.sig
@@ -34,4 +34,6 @@ signature PRIM = sig
 
     val p_t : t Print.printer
 
+    val equal : t * t -> bool
+
 end