Fix unbound name problem in Jscomp injectors; more List stuff

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index 0aae9010..89dc8bbd 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -150,3 +150,14 @@ fun search [a] [b] f =
         search'
     end
 
+fun foldlM [m] (_ : monad m) [a] [b] f =
+    let
+        fun foldlM' acc ls =
+            case ls of
+                [] => return acc
+              | x :: ls =>
+                acc <- f x acc;
+                foldlM' acc ls
+    in
+        foldlM'
+    end
diff --git a/lib/ur/list.urs b/lib/ur/list.urs
index 1b80a9d3..89e7eecb 100644
--- a/lib/ur/list.urs
+++ b/lib/ur/list.urs
@@ -24,6 +24,9 @@ val filter : a ::: Type -> (a -> bool) -> t a -> t a
 
 val exists : a ::: Type -> (a -> bool) -> t a -> bool
 
+val foldlM : m ::: (Type -> Type) -> monad m -> a ::: Type -> b ::: Type
+             -> (a -> b -> m b) -> b -> t a -> m b
+
 val foldlMap : a ::: Type -> b ::: Type -> c ::: Type
                -> (a -> b -> c * b) -> b -> t a -> t c * b