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-rw-r--r--src/prim.sig2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/prim.sig b/src/prim.sig
index 3083a26e..54625379 100644
--- a/src/prim.sig
+++ b/src/prim.sig
@@ -38,4 +38,6 @@ signature PRIM = sig
val equal : t * t -> bool
val compare : t * t -> order
+ val toString : t -> string
+
end