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-rw-r--r--src/search.sml3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/search.sml b/src/search.sml
index 6b78e9b2..563496fe 100644
--- a/src/search.sml
+++ b/src/search.sml
@@ -37,6 +37,9 @@ type ('data, 'state, 'abort) mapfold_arg =
type ('data, 'state, 'abort) mapfolder =
'data -> 'state -> ('data * 'state, 'abort) result
+type ('context, 'data, 'state, 'abort) mapfolderB =
+ 'context -> 'data -> 'state -> ('data * 'state, 'abort) result
+
fun return2 v acc = Continue (v, acc)
fun map (r, f) =