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-rw-r--r--lib/future.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/future.ml b/lib/future.ml
index b82948276..690255edd 100644
--- a/lib/future.ml
+++ b/lib/future.ml
@@ -27,7 +27,7 @@ let _ = Errors.register_handler (function
| _ -> raise Errors.Unhandled)
type fix_exn = exn -> exn
-let id x = prerr_endline "no fix_exn"; x
+let id x = prerr_endline "Future: no fix_exn.\nYou have probably created a Future.computation from a value without passing the ~fix_exn argument. You probably want to chain with an already existing future instead."; x
module UUID = struct
type t = int