2 files changed, 15 insertions, 0 deletions
diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index bce5335e..cbb4faf2 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -437,3 +437,15 @@ fun mapXiM [m ::: Type -> Type] (_ : monad m) [a] [ctx ::: {Unit}] (f : int -> a
     in
         mapXiM' 0
     end
+
+fun tabulateM [m] (_ : monad m) [a] (f : int -> m a) n =
+    let
+        fun tabulate' n acc =
+            if n <= 0 then
+                return acc
+            else
+                (v <- f (n-1);
+                 tabulate' (n-1) (v :: acc))
+    in
+        tabulate' n []
+    end
diff --git a/lib/ur/list.urs b/lib/ur/list.urs
index b26c9ad9..66007a39 100644
--- a/lib/ur/list.urs
+++ b/lib/ur/list.urs
@@ -63,6 +63,9 @@ val all : a ::: Type -> (a -> bool) -> t a -> bool
 val app : m ::: (Type -> Type) -> monad m -> a ::: Type
           -> (a -> m unit) -> t a -> m unit
 
+val tabulateM : m ::: (Type -> Type) -> monad m -> a ::: Type
+                -> (int -> m a) -> int -> m (t a)
+
 val mapQuery : tables ::: {{Type}} -> exps ::: {Type} -> t ::: Type
                -> [tables ~ exps] =>
     sql_query [] [] tables exps