4 files changed, 26 insertions, 11 deletions

diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index b99ef515..d774cc54 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -31,17 +31,17 @@ fun foldl [a] [b] f =
         foldl'
     end
 
-fun foldlPartial [a] [b] f =
+fun foldlAbort [a] [b] f =
     let
-        fun foldlPartial' acc ls =
+        fun foldlAbort' acc ls =
             case ls of
                 [] => Some acc
               | x :: ls =>
                 case f x acc of
                     None => None
-                  | Some acc' => foldlPartial' acc' ls
+                  | Some acc' => foldlAbort' acc' ls
     in
-        foldlPartial'
+        foldlAbort'
     end
 
 val rev = fn [a] =>
@@ -54,6 +54,19 @@ val rev = fn [a] =>
                  rev' []
              end
 
+fun foldlMapAbort [a] [b] [c] f =
+    let
+        fun foldlMapAbort' ls' acc ls =
+            case ls of
+                [] => Some (rev ls', acc)
+              | x :: ls =>
+                case f x acc of
+                    None => None
+                  | Some (x', acc') => foldlMapAbort' (x' :: ls') acc' ls
+    in
+        foldlMapAbort' []
+    end
+
 val revAppend = fn [a] =>
                    let
                        fun ra (ls : list a) acc =
diff --git a/lib/ur/list.urs b/lib/ur/list.urs
index f5495d41..1b0fced9 100644
--- a/lib/ur/list.urs
+++ b/lib/ur/list.urs
@@ -4,7 +4,9 @@ val show : a ::: Type -> show a -> show (t a)
 val eq : a ::: Type -> eq a -> eq (t a)
 
 val foldl : a ::: Type -> b ::: Type -> (a -> b -> b) -> b -> t a -> b
-val foldlPartial : a ::: Type -> b ::: Type -> (a -> b -> option b) -> b -> t a -> option b
+val foldlAbort : a ::: Type -> b ::: Type -> (a -> b -> option b) -> b -> t a -> option b
+val foldlMapAbort : a ::: Type -> b ::: Type -> c ::: Type
+                    -> (a -> b -> option (c * b)) -> b -> t a -> option (t c * b)
 
 val rev : a ::: Type -> t a -> t a
 
diff --git a/lib/ur/listPair.ur b/lib/ur/listPair.ur
index 745e436c..0182af19 100644
--- a/lib/ur/listPair.ur
+++ b/lib/ur/listPair.ur
@@ -1,15 +1,15 @@
-fun foldlPartial [a] [b] [c] f =
+fun foldlAbort [a] [b] [c] f =
     let
-        fun foldlPartial' acc ls1 ls2 =
+        fun foldlAbort' acc ls1 ls2 =
             case (ls1, ls2) of
                 ([], []) => Some acc
               | (x1 :: ls1, x2 :: ls2) =>
                 (case f x1 x2 acc of
                      None => None
-                   | Some acc' => foldlPartial' acc' ls1 ls2)
+                   | Some acc' => foldlAbort' acc' ls1 ls2)
               | _ => None
     in
-        foldlPartial'
+        foldlAbort'
     end
 
 fun mapX [a] [b] [ctx ::: {Unit}] f =
diff --git a/lib/ur/listPair.urs b/lib/ur/listPair.urs
index 310a1a4e..f2287c13 100644
--- a/lib/ur/listPair.urs
+++ b/lib/ur/listPair.urs
@@ -1,5 +1,5 @@
-val foldlPartial : a ::: Type -> b ::: Type -> c ::: Type
-                   -> (a -> b -> c -> option c) -> c -> list a -> list b -> option c
+val foldlAbort : a ::: Type -> b ::: Type -> c ::: Type
+                 -> (a -> b -> c -> option c) -> c -> list a -> list b -> option c
 
 val mapX : a ::: Type -> b ::: Type -> ctx ::: {Unit}
            -> (a -> b -> xml ctx [] []) -> list a -> list b -> xml ctx [] []