proper context for Syntax.parse_token;

--- a/src/Pure/Isar/proof_context.ML	Sun Aug 08 19:54:54 2010 +0200
+++ b/src/Pure/Isar/proof_context.ML	Sun Aug 08 20:03:31 2010 +0200
@@ -738,14 +738,14 @@
 
 fun parse_sort ctxt text =
   let
-    val (syms, pos) = Syntax.parse_token Markup.sort text;
+    val (syms, pos) = Syntax.parse_token ctxt Markup.sort text;
     val S = Syntax.standard_parse_sort ctxt (syn_of ctxt) (syms, pos)
       handle ERROR msg => cat_error msg ("Failed to parse sort" ^ Position.str_of pos)
   in Type.minimize_sort (tsig_of ctxt) S end;
 
 fun parse_typ ctxt text =
   let
-    val (syms, pos) = Syntax.parse_token Markup.typ text;
+    val (syms, pos) = Syntax.parse_token ctxt Markup.typ text;
     val T = Syntax.standard_parse_typ ctxt (syn_of ctxt) (get_sort ctxt) (syms, pos)
       handle ERROR msg => cat_error msg ("Failed to parse type" ^ Position.str_of pos);
   in T end;
@@ -756,7 +756,7 @@
 
     val (T', _) = Type_Infer.paramify_dummies T 0;
     val (markup, kind) = if T' = propT then (Markup.prop, "proposition") else (Markup.term, "term");
-    val (syms, pos) = Syntax.parse_token markup text;
+    val (syms, pos) = Syntax.parse_token ctxt markup text;
 
     fun check t = (Syntax.check_term ctxt (Type_Infer.constrain T' t); NONE)
       handle ERROR msg => SOME msg;

--- a/src/Pure/Syntax/syntax.ML	Sun Aug 08 19:54:54 2010 +0200
+++ b/src/Pure/Syntax/syntax.ML	Sun Aug 08 20:03:31 2010 +0200
@@ -80,7 +80,7 @@
     (string * string) trrule list -> syntax -> syntax
   val update_trrules_i: ast trrule list -> syntax -> syntax
   val remove_trrules_i: ast trrule list -> syntax -> syntax
-  val parse_token: Markup.T -> string -> Symbol_Pos.T list * Position.T
+  val parse_token: Proof.context -> Markup.T -> string -> Symbol_Pos.T list * Position.T
   val parse_sort: Proof.context -> string -> sort
   val parse_typ: Proof.context -> string -> typ
   val parse_term: Proof.context -> string -> term
@@ -694,10 +694,10 @@
 
 (* (un)parsing *)
 
-fun parse_token markup str =
+fun parse_token ctxt markup str =
   let
     val (syms, pos) = read_token str;
-    val _ = Position.report markup pos;
+    val _ = Context_Position.report ctxt markup pos;
   in (syms, pos) end;
 
 local