added fix_mixfix;

--- a/src/Pure/Syntax/mixfix.ML	Fri Jun 19 11:20:36 1998 +0200
+++ b/src/Pure/Syntax/mixfix.ML	Sat Jun 20 19:52:53 1998 +0200
@@ -25,6 +25,7 @@
   val no_syn: 'a * 'b -> 'a * 'b * mixfix
   val type_name: string -> mixfix -> string
   val const_name: string -> mixfix -> string
+  val fix_mixfix: string -> mixfix -> mixfix
   val mixfix_args: mixfix -> int
   val pure_nonterms: string list
   val pure_syntax: (string * string * mixfix) list
@@ -85,6 +86,10 @@
   | const_name c (Infixr _) = "op " ^ strip_esc c
   | const_name c _ = c;
 
+fun fix_mixfix c (Infixl p) = (InfixlName (c, p))
+  | fix_mixfix c (Infixr p) = (InfixrName (c, p))
+  | fix_mixfix _ mx = mx;
+
 
 (* mixfix_args *)