Log (coq-lsp.Fleche.Io.Log)

val trace : 
  string ->
  ?extra:string ->
  ('a, Stdlib.Format.formatter, unit) Stdlib.format ->
  'a

Debug trace

val trace_ : string -> ?extra:string -> string -> unit

Raw LSP method

val trace_object : string -> Yojson.Safe.t -> unit

Log JSON object to server info log

val feedback : Loc.t Coq.Message.t list -> unit

For unexpected feedback, remove eventually or just assert false?