diff --git a/petanque/json_shell/lsp_lwt/io.ml b/petanque/json_shell/lsp_lwt/io.ml
index 52e9d0e85..5f19e5e76 100644
--- a/petanque/json_shell/lsp_lwt/io.ml
+++ b/petanque/json_shell/lsp_lwt/io.ml
@@ -4,27 +4,19 @@ module J = Yojson.Safe
 
 (* IO for JSON/RPC with Lwt, we could put this in the lsp module, however we
    don't want to pull Lwt as a dependency for coq-lsp *)
-let mut = Mutex.create ()
+(* let mut = Mutex.create () *)
+
+(* let read_raw_request ic = let* cl = Lwt_io.read_line ic in let sin =
+   Scanf.Scanning.from_string cl in let+ raw_obj = Scanf.bscanf sin
+   "Content-Length: %d\r" (fun size -> (* Consume the second \r\n or header *)
+   let* ohdr = Lwt_io.read_line ic in (* If the second line is a return, then no
+   more headers *) let* () = if ohdr.[0] = '\r' then return () else (* Fixme (or
+   use ocaml-lsp) Skip the Content-type header *) let+ _ = Lwt_io.read_line ic
+   in () in let buf = Bytes.create size in let+ () = Lwt_io.read_into_exactly ic
+   buf 0 size in Bytes.to_string buf) in J.from_string raw_obj *)
 
 let read_raw_request ic =
-  let* cl = Lwt_io.read_line ic in
-  let sin = Scanf.Scanning.from_string cl in
-  let+ raw_obj =
-    Scanf.bscanf sin "Content-Length: %d\r" (fun size ->
-        (* Consume the second \r\n or header *)
-        let* ohdr = Lwt_io.read_line ic in
-        (* If the second line is a return, then no more headers *)
-        let* () =
-          if ohdr.[0] = '\r' then return ()
-          else
-            (* Fixme (or use ocaml-lsp) Skip the Content-type header *)
-            let+ _ = Lwt_io.read_line ic in
-            ()
-        in
-        let buf = Bytes.create size in
-        let+ () = Lwt_io.read_into_exactly ic buf 0 size in
-        Bytes.to_string buf)
-  in
+  let+ raw_obj = Lwt_io.read_line ic in
   J.from_string raw_obj
 
 let read_raw_request ic =
@@ -50,10 +42,7 @@ let read_request ic =
   let+ raw_request = read_raw_request ic in
   Option.map (fun r -> Result.bind r Lsp.Base.Message.from_yojson) raw_request
 
-let send_json fmt obj =
-  Mutex.lock mut;
-  let msg = J.to_string obj ^ "\n" in
-  let size = String.length msg in
-  let* () = Lwt_io.fprintf fmt "Content-Length: %d\r\n\r\n%s%!" size msg in
-  Mutex.unlock mut;
-  return ()
+let send_json fmt obj = Lwt_io.fprintl fmt (J.to_string obj)
+(* Mutex.lock mut; let msg = J.to_string obj ^ "\n" in let size = String.length
+   msg in let* () = Lwt_io.fprintf fmt "Content-Length: %d\r\n\r\n%s%!" size msg
+   in Mutex.unlock mut; return () *)