src/Pure/Isar/token.ML
changeset 61825 69b035408b18
parent 61822 a16497c686cb
child 62094 7d47cf67516d
--- a/src/Pure/Isar/token.ML	Thu Dec 10 13:38:40 2015 +0000
+++ b/src/Pure/Isar/token.ML	Thu Dec 10 15:53:28 2015 +0100
@@ -477,7 +477,7 @@
 
 (* src *)
 
-fun dest_src [] = raise Fail "Empty token source"
+fun dest_src ([]: src) = raise Fail "Empty token source"
   | dest_src (head :: args) = (head, args);
 
 fun name_of_src src =