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-rw-r--r--src/primes.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/primes.ml b/src/primes.ml
index 21d979a..a95fb64 100644
--- a/src/primes.ml
+++ b/src/primes.ml
@@ -26,7 +26,7 @@ module Primes (K : Kahn.S) = struct
(get qi) >>= (fun v ->
if v <> -1 then
begin
- Format.eprintf "%d@." v;
+ K.output @@ Format.sprintf "%d@." v;
(delay new_channel ()) >>=
(fun (qi2, qo2) -> doco [ filter v qi qo2 ; primes qi2 ])
end