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-rw-r--r--src/list_util.sig3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/list_util.sig b/src/list_util.sig
index 4c4aa955..6ec109da 100644
--- a/src/list_util.sig
+++ b/src/list_util.sig
@@ -30,4 +30,7 @@ signature LIST_UTIL = sig
val mapfoldl : ('data1 * 'state -> 'state * 'data2) -> 'state -> 'data1 list
-> 'state * 'data2 list
+ val mapfold : ('data, 'state, 'abort) Search.mapfolder
+ -> ('data list, 'state, 'abort) Search.mapfolder
+
end