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-rw-r--r--abstract/value_domain.ml3
1 files changed, 3 insertions, 0 deletions
diff --git a/abstract/value_domain.ml b/abstract/value_domain.ml
index a0f082f..9cf6d76 100644
--- a/abstract/value_domain.ml
+++ b/abstract/value_domain.ml
@@ -25,4 +25,7 @@ module type VALUE_DOMAIN = sig
(* boolean test *)
val leq : t -> t -> t * t (* For intervals : [a, b] -> [c, d] -> ([a, min b d], [max a c, d]) *)
+
+ (* pretty-printing *)
+ val to_string : t -> string
end