diff -r ad3a8569759c -r 2a45e400fdad src/Tools/induct.ML
--- a/src/Tools/induct.ML	Mon Oct 08 22:06:32 2007 +0200
+++ b/src/Tools/induct.ML	Tue Oct 09 00:20:13 2007 +0200
@@ -718,7 +718,7 @@
     inst >> Option.map (pair NONE);
 
 val free = Scan.state -- Args.term >> (fn (_, Free v) => v | (context, t) =>
-  error ("Bad free variable: " ^ ProofContext.string_of_term (Context.proof_of context) t));
+  error ("Bad free variable: " ^ Syntax.string_of_term (Context.proof_of context) t));
 
 fun unless_more_args scan = Scan.unless (Scan.lift
   ((Args.$$$ arbitraryN || Args.$$$ takingN || Args.$$$ typeN ||