src/Pure/ML-Systems/polyml.ML

 val pointer_eq = PolyML.pointerEq;
 
 
 (* runtime compilation *)
 
-fun use_text (tune: string -> string) (line, name) (print, err) verbose txt =
+local
+
+fun drop_newline s =
+  if String.isSuffix "\n" s then String.substring (s, 0, size s - 1)
+  else s;
+
+in
+
+fun use_text (tune: string -> string) str_of_pos (start_line, name) (print, err) verbose txt =
   let
+    val current_line = ref start_line;
     val in_buffer = ref (String.explode (tune txt));
     val out_buffer = ref ([]: string list);
-    fun output () = implode (rev (case ! out_buffer of "\n" :: cs => cs | cs => cs));
+    fun output () = drop_newline (implode (rev (! out_buffer)));
 
-    val current_line = ref line;
     fun get () =
       (case ! in_buffer of
         [] => NONE
       | c :: cs =>
           (in_buffer := cs; if c = #"\n" then current_line := ! current_line + 1 else (); SOME c));
     fun put s = out_buffer := s :: ! out_buffer;
+    fun message (msg, is_err, line) =
+      (if is_err then "Error: " else "Warning: ") ^ drop_newline msg ^ str_of_pos line name ^ "\n";
 
     val parameters =
      [PolyML.Compiler.CPOutStream put,
       PolyML.Compiler.CPLineNo (fn () => ! current_line),
-      PolyML.Compiler.CPFileName name];
+      PolyML.Compiler.CPErrorMessageProc (put o message)];
     val _ =
       (while not (List.null (! in_buffer)) do
         PolyML.compiler (get, parameters) ())
       handle exn =>
        (put ("Exception- " ^ General.exnMessage exn ^ " raised");
         err (output ()); raise exn);
-  in
-    if verbose then print (output ()) else ()
-  end;
+  in if verbose then print (output ()) else () end;
 
-fun use_file tune output verbose name =
+fun use_file tune str_of_pos output verbose name =
   let
     val instream = TextIO.openIn name;
     val txt = Exn.release (Exn.capture TextIO.inputAll instream before TextIO.closeIn instream);
-  in use_text tune (1, name) output verbose txt end;
+  in use_text tune str_of_pos (1, name) output verbose txt end;
 
+end;
+