diff --git a/controller/coq_lsp.ml b/controller/coq_lsp.ml
index 52f85e258..33e7e95be 100644
--- a/controller/coq_lsp.ml
+++ b/controller/coq_lsp.ml
@@ -138,6 +138,12 @@ let lsp_of_diags ~uri ~version diags =
     diags
   |> LSP.mk_diagnostics ~uri ~version
 
+let asts_of_doc doc =
+  List.filter_map (fun v -> v.Fleche.Doc.ast) doc.Fleche.Doc.nodes
+
+let diags_of_doc doc =
+  List.concat_map (fun node -> node.Fleche.Doc.diags) doc.Fleche.Doc.nodes
+
 module Check = struct
   let pending = ref None
 
@@ -146,7 +152,8 @@ module Check = struct
     let doc = Hashtbl.find doc_table uri in
     let doc = Fleche.Doc.check ~ofmt ~doc ~fb_queue in
     Hashtbl.replace doc_table doc.uri doc;
-    let diags = lsp_of_diags ~uri:doc.uri ~version:doc.version doc.diags in
+    let diags = diags_of_doc doc in
+    let diags = lsp_of_diags ~uri:doc.uri ~version:doc.version diags in
     LIO.send_json ofmt @@ diags
 
   let completed uri =
@@ -231,7 +238,7 @@ let _kind_of_type _tm = 13
 let do_symbols ofmt ~id params =
   let file, doc = grab_doc params in
   let f loc id = mk_syminfo file (Names.Id.to_string id, "", 12, loc) in
-  let ast = List.map (fun v -> v.Fleche.Doc.ast) doc.Fleche.Doc.nodes in
+  let ast = asts_of_doc doc in
   let slist = Coq.Ast.grab_definitions f ast in
   let msg = LSP.mk_reply ~id ~result:(`List slist) in
   LIO.send_json ofmt msg
@@ -244,23 +251,21 @@ let get_docTextPosition params =
   (file, (line, character))
 
 (* XXX refactor *)
-let ast_info ast =
-  let loc = Coq.Ast.loc ast |> Option.get in
-  Pp.string_of_ppcmds (Loc.pr loc)
+let loc_info loc = Coq.Ast.pr_loc loc
 
 let do_hover ofmt ~id params =
-  let show_ast_info = false in
+  let show_loc_info = true in
   let uri, point = get_docTextPosition params in
   let doc = Hashtbl.find doc_table uri in
-  let ast_string =
-    Fleche.Info.LC.ast ~doc ~point Exact
-    |> Option.map ast_info |> Option.default "no ast"
+  let loc_string =
+    Fleche.Info.LC.loc ~doc ~point Exact
+    |> Option.map loc_info |> Option.default "no ast"
   in
   let info_string =
     Fleche.Info.LC.info ~doc ~point Exact |> Option.default "no info"
   in
   let hover_string =
-    if show_ast_info then ast_string ^ "\n___\n" ^ info_string else info_string
+    if show_loc_info then loc_string ^ "\n___\n" ^ info_string else info_string
   in
   let result =
     `Assoc
@@ -276,7 +281,7 @@ let do_completion ofmt ~id params =
   let uri, _ = get_docTextPosition params in
   let doc = Hashtbl.find doc_table uri in
   let f _loc id = `Assoc [ ("label", `String Names.Id.(to_string id)) ] in
-  let ast = List.map (fun v -> v.Fleche.Doc.ast) doc.Fleche.Doc.nodes in
+  let ast = asts_of_doc doc in
   let clist = Coq.Ast.grab_definitions f ast in
   let result = `List clist in
   let msg = LSP.mk_reply ~id ~result in
diff --git a/coq/ast.ml b/coq/ast.ml
index f1384a76a..91baf3d6f 100644
--- a/coq/ast.ml
+++ b/coq/ast.ml
@@ -75,3 +75,17 @@ let grab_definitions f nodes =
 
 let marshal_in ic : t = Marshal.from_channel ic
 let marshal_out oc v = Marshal.to_channel oc v []
+
+let pr_loc ?(print_file = false) loc =
+  let open Loc in
+  let file =
+    if print_file then
+      match loc.fname with
+      | ToplevelInput -> "Toplevel input"
+      | InFile { file; _ } -> "File \"" ^ file ^ "\""
+    else "loc"
+  in
+  Format.asprintf "%s: line: %d, col: %d -- line: %d, col: %d / {%d-%d}" file
+    loc.line_nb (loc.bp - loc.bol_pos) loc.line_nb_last
+    (loc.ep - loc.bol_pos_last)
+    loc.bp loc.ep
diff --git a/coq/ast.mli b/coq/ast.mli
index c4bdca512..132805ba6 100644
--- a/coq/ast.mli
+++ b/coq/ast.mli
@@ -9,3 +9,4 @@ val print : t -> Pp.t
 val grab_definitions : (Loc.t -> Names.Id.t -> 'a) -> t list -> 'a list
 val marshal_in : in_channel -> t
 val marshal_out : out_channel -> t -> unit
+val pr_loc : ?print_file:bool -> Loc.t -> string
diff --git a/fleche/doc.ml b/fleche/doc.ml
index 260152df4..50797c7d4 100644
--- a/fleche/doc.ml
+++ b/fleche/doc.ml
@@ -18,8 +18,10 @@ let hd_opt ~default l =
 (* [node list] is a very crude form of a meta-data map "loc -> data" , where for
    now [data] is only the goals. *)
 type node =
-  { ast : Coq.Ast.t  (** Ast of node *)
+  { loc : Loc.t
+  ; ast : Coq.Ast.t option  (** Ast of node *)
   ; state : Coq.State.t  (** (Full) State of node *)
+  ; diags : Types.Diagnostic.t list
   ; memo_info : string
   }
 
@@ -38,7 +40,6 @@ type t =
   ; contents : string
   ; root : Coq.State.t
   ; nodes : node list
-  ; diags : Types.Diagnostic.t list
   ; diags_dirty : bool  (** Used to optimize `eager_diagnostics` *)
   ; completed : Completion.t
   }
@@ -56,7 +57,6 @@ let create ~state ~workspace ~uri ~version ~contents =
   ; version
   ; root = mk_doc state workspace
   ; nodes = []
-  ; diags = []
   ; diags_dirty = false
   ; completed = Stopped (init_loc ~uri)
   }
@@ -66,22 +66,24 @@ let bump_version ~version ~text doc =
   { doc with
     version
   ; nodes = []
-  ; diags = []
   ; contents = text
   ; diags_dirty = false
   ; completed = Stopped (init_loc ~uri:doc.uri)
   }
 
-let add_node ~node ~diags doc =
-  let diags_dirty = if diags <> [] then true else doc.diags_dirty in
-  { doc with nodes = node :: doc.nodes; diags = diags @ doc.diags; diags_dirty }
+let add_node ~node doc =
+  let diags_dirty = if node.diags <> [] then true else doc.diags_dirty in
+  { doc with nodes = node :: doc.nodes; diags_dirty }
+
+let concat_diags doc = List.concat_map (fun node -> node.diags) doc.nodes
 
 let send_eager_diagnostics ~uri ~version ~doc =
   (* this is too noisy *)
   (* let proc_diag = mk_diag loc 3 (Pp.str "Processing") in *)
   (* Io.Report.diagnostics ~uri ~version (proc_diag :: doc.diags)); *)
   if doc.diags_dirty && !Config.v.eager_diagnostics then (
-    Io.Report.diagnostics ~uri ~version doc.diags;
+    let diags = concat_diags doc in
+    Io.Report.diagnostics ~uri ~version diags;
     { doc with diags_dirty = false })
   else doc
 
@@ -152,7 +154,7 @@ let debug_parsed_sentence ~ast =
 
 type process_action =
   | EOF of Completion.t (* completed *)
-  | Skip of Loc.t (* last valid token *)
+  | Skip of Loc.t * Loc.t (* span of the skipped sentence + last valid token *)
   | Process of Coq.Ast.t (* ast to process *)
 
 (* Make each fb a diag *)
@@ -203,13 +205,22 @@ let interp_and_info ~parsing_time ~st ~fb_queue ast =
   in
   (res, memo_info ^ "\n___\n" ^ mem_info)
 
+let build_span start_loc end_loc =
+  Loc.
+    { start_loc with
+      line_nb_last = end_loc.line_nb_last
+    ; bol_pos_last = end_loc.bol_pos_last
+    ; ep = end_loc.ep
+    }
+
 (* XXX: Imperative problem *)
 let process_and_parse ~uri ~version ~fb_queue doc last_tok doc_handle =
   let rec stm doc st last_tok =
     let doc = send_eager_diagnostics ~uri ~version ~doc in
     if Debug.parsing then Io.Log.error "coq" "parsing sentence";
     (* Parsing *)
-    let action, pdiags, parsing_time =
+    let action, parsing_diags, parsing_time =
+      let start_loc = Pcoq.Parsable.loc doc_handle |> CLexer.after in
       match parse_stm ~st doc_handle with
       | Coq.Protect.R.Interrupted, time -> (EOF (Stopped last_tok), [], time)
       | Coq.Protect.R.Completed res, time -> (
@@ -219,21 +230,32 @@ let process_and_parse ~uri ~version ~fb_queue doc last_tok doc_handle =
           let () = if Debug.parsing then debug_parsed_sentence ~ast in
           (Process ast, [], time)
         | Error (loc, msg) ->
-          let loc = Option.get loc in
-          let diags = [ mk_diag loc 1 msg ] in
+          let err_loc = Option.get loc in
+          let diags = [ mk_diag err_loc 1 msg ] in
           discard_to_dot doc_handle;
           let last_tok = Pcoq.Parsable.loc doc_handle in
-          (Skip last_tok, diags, time))
+          let span_loc = build_span start_loc last_tok in
+          (Skip (span_loc, last_tok), diags, time))
     in
-    let doc = { doc with diags = pdiags @ doc.diags } in
     (* Execution *)
     match action with
     (* End of file *)
     | EOF completed -> set_completion ~completed doc
-    | Skip last_tok -> stm doc st last_tok
+    | Skip (span_loc, last_tok) ->
+      (* We add the parsing diags *)
+      let node =
+        { loc = span_loc
+        ; ast = None
+        ; diags = parsing_diags
+        ; state = st
+        ; memo_info = ""
+        }
+      in
+      let doc = add_node ~node doc in
+      stm doc st last_tok
     (* We interpret the command now *)
     | Process ast -> (
-      let loc = Coq.Ast.loc ast |> Option.get in
+      let ast_loc = Coq.Ast.loc ast |> Option.get in
       (* We register pre-interp for now *)
       register_hack_proof_recover ast st;
       let res, memo_info = interp_and_info ~parsing_time ~st ~fb_queue ast in
@@ -249,25 +271,29 @@ let process_and_parse ~uri ~version ~fb_queue doc last_tok doc_handle =
           (* let goals = Coq.State.goals *)
           let diags =
             if !Config.v.ok_diagnostics then
-              let ok_diag = mk_diag loc 3 (Pp.str "OK") in
+              let ok_diag = mk_diag ast_loc 3 (Pp.str "OK") in
               [ ok_diag ]
             else []
           in
-          let fb_diags = process_feedback ~loc feedback in
-          let diags = fb_diags @ diags in
-          let node = { ast; state; memo_info } in
-          let doc = add_node ~node ~diags doc in
+          let fb_diags = process_feedback ~loc:ast_loc feedback in
+          let diags = parsing_diags @ fb_diags @ diags in
+          let node =
+            { loc = ast_loc; ast = Some ast; diags; state; memo_info }
+          in
+          let doc = add_node ~node doc in
           stm doc state last_tok_new
         | Error (err_loc, msg) ->
-          let loc = Option.default loc err_loc in
-          let diags = [ mk_error_diagnostic ~loc ~msg ~ast ] in
+          let err_loc = Option.default ast_loc err_loc in
+          let diags = [ mk_error_diagnostic ~loc:err_loc ~msg ~ast ] in
           (* FB should be handled by Coq.Protect.eval XXX *)
-          let fb_diags = List.rev !fb_queue |> process_feedback ~loc in
+          let fb_diags = List.rev !fb_queue |> process_feedback ~loc:err_loc in
           fb_queue := [];
-          let diags = fb_diags @ diags in
+          let diags = parsing_diags @ fb_diags @ diags in
           let st = state_recovery_heuristic st ast in
-          let node = { ast; state = st; memo_info } in
-          let doc = add_node ~node ~diags doc in
+          let node =
+            { loc = ast_loc; ast = Some ast; diags; state = st; memo_info }
+          in
+          let doc = add_node ~node doc in
           stm doc st last_tok_new))
   in
   (* Note that nodes and diags in reversed order here *)
@@ -336,22 +362,12 @@ let check ~ofmt:_ ~doc ~fb_queue =
     in
     (* Set the document to "internal" mode *)
     let doc =
-      { doc with
-        contents = processed_content
-      ; nodes = List.rev doc.nodes
-      ; diags = List.rev doc.diags
-      }
+      { doc with contents = processed_content; nodes = List.rev doc.nodes }
     in
     let doc = process_and_parse ~uri ~version ~fb_queue doc last_tok handle in
     (* Set the document to "finished" mode: Restore the original contents,
        reverse the accumulators *)
-    let doc =
-      { doc with
-        nodes = List.rev doc.nodes
-      ; diags = List.rev doc.diags
-      ; contents
-      }
-    in
+    let doc = { doc with nodes = List.rev doc.nodes; contents } in
     let end_msg =
       match doc.completed with
       | Yes ->
diff --git a/fleche/doc.mli b/fleche/doc.mli
index 02718e4a5..37c5da7ae 100644
--- a/fleche/doc.mli
+++ b/fleche/doc.mli
@@ -19,8 +19,10 @@
 (* [node list] is a very crude form of a meta-data map "loc -> data" , where for
    now [data] is only the goals. *)
 type node =
-  { ast : Coq.Ast.t  (** Ast of node *)
+  { loc : Loc.t
+  ; ast : Coq.Ast.t option  (** Ast of node *)
   ; state : Coq.State.t  (** (Full) State of node *)
+  ; diags : Types.Diagnostic.t list  (** Diagnostics associated to the node *)
   ; memo_info : string
   }
 
@@ -36,7 +38,6 @@ type t = private
   ; contents : string
   ; root : Coq.State.t
   ; nodes : node list
-  ; diags : Types.Diagnostic.t list
   ; diags_dirty : bool
   ; completed : Completion.t
   }
diff --git a/fleche/info.ml b/fleche/info.ml
index e58d80413..558493441 100644
--- a/fleche/info.ml
+++ b/fleche/info.ml
@@ -113,6 +113,7 @@ module type S = sig
 
   type ('a, 'r) query = doc:Doc.t -> point:P.t -> 'a -> 'r option
 
+  val loc : (approx, Loc.t) query
   val ast : (approx, Coq.Ast.t) query
   val goals : (approx, Coq.Goals.reified_pp) query
   val info : (approx, string) query
@@ -130,13 +131,13 @@ module Make (P : Point) : S with module P := P = struct
       match l with
       | [] -> prev
       | node :: xs -> (
-        let loc = Coq.Ast.loc node.Doc.ast in
+        let loc = node.Doc.loc in
         match approx with
-        | Exact -> if P.in_range ?loc point then Some node else find None xs
+        | Exact -> if P.in_range ~loc point then Some node else find None xs
         | PrevIfEmpty ->
-          if P.gt_range ?loc point then prev else find (Some node) xs
+          if P.gt_range ~loc point then prev else find (Some node) xs
         | Prev ->
-          if P.gt_range ?loc point || P.in_range ?loc point then prev
+          if P.gt_range ~loc point || P.in_range ~loc point then prev
           else find (Some node) xs)
     in
     find None doc.Doc.nodes
@@ -168,8 +169,13 @@ module Make (P : Point) : S with module P := P = struct
     let lemmas = Coq.State.lemmas ~st in
     Option.cata (reify_goals ppx) None lemmas
 
+  let loc ~doc ~point approx =
+    let node = find ~doc ~point approx in
+    Option.map (fun node -> node.Doc.loc) node
+
   let ast ~doc ~point approx =
-    find ~doc ~point approx |> Option.map (fun node -> node.Doc.ast)
+    let node = find ~doc ~point approx in
+    Option.bind node (fun node -> node.Doc.ast)
 
   let goals ~doc ~point approx =
     find ~doc ~point approx
diff --git a/fleche/info.mli b/fleche/info.mli
index 71445c4fa..d51319b47 100644
--- a/fleche/info.mli
+++ b/fleche/info.mli
@@ -44,6 +44,7 @@ module type S = sig
 
   type ('a, 'r) query = doc:Doc.t -> point:P.t -> 'a -> 'r option
 
+  val loc : (approx, Loc.t) query
   val ast : (approx, Coq.Ast.t) query
   val goals : (approx, Coq.Goals.reified_pp) query
   val info : (approx, string) query