1 files changed, 31 insertions, 0 deletions

diff --git a/lib/prelude.ml b/lib/prelude.ml
new file mode 100644
index 0000000..57f7af3
--- /dev/null
+++ b/lib/prelude.ml
@@ -0,0 +1,31 @@
+include Core
+module Time_ns = Time_ns_unix
+
+module List = struct
+  include List
+
+  let map_result ~(f : 'a -> ('b, 'c) result) : 'a list -> ('b list, 'c) result
+      =
+    let open Result.Let_syntax in
+    let rec go = function
+      | [] -> return []
+      | x :: xs ->
+          let%map x' = f x and xs' = go xs in
+          x' :: xs'
+    in
+    go
+end
+
+module Z = struct
+  include Z
+
+  let sexp_of_t x = Sexp.Atom (Z.to_string x)
+end
+
+module Result = struct
+  include Result
+
+  let unwrap = function
+    | Error _ -> failwith "Result.unwrap: unexpected (Error _)"
+    | Ok v -> v
+end