1 files changed, 5 insertions, 4 deletions
diff --git a/stream.sml b/stream.sml
index ff4a6ad..fd5932a 100644
--- a/stream.sml
+++ b/stream.sml
@@ -28,12 +28,13 @@ structure Stream :> STREAM = struct
     end
     z
 
-  fun pos2str (Pos (pos, line, col)) =
+  val Ppos = fn z =>
   let
-    val % = Int.toString
+    fun p (out, Pos (fname, line, col)) =
+        Printf out `fname `":" I line `":" I col %
   in
-    pos ^ ":" ^ %line ^ ":" ^ %col
-  end
+    bind A1 p
+  end z
 
   fun getcharSure (S as { contents, off, ... }: t) =
       (String.sub (contents, off), updateStream S s#off (off + 1) %)