diff -r b5eb7c688836 -r 740a0ca7e09b src/Pure/Thy/thy_info.scala
--- a/src/Pure/Thy/thy_info.scala	Sun Mar 15 19:48:49 2015 +0100
+++ b/src/Pure/Thy/thy_info.scala	Sun Mar 15 20:35:47 2015 +0100
@@ -134,7 +134,7 @@
       try {
         if (initiators.contains(name)) error(cycle_msg(initiators))
         val header =
-          try { resources.check_thy(session, name).cat_errors(message) }
+          try { resources.check_thy(session, name, Token.Pos.file(name.node)).cat_errors(message) }
           catch { case ERROR(msg) => cat_error(msg, message) }
         Dep(name, header) :: require_thys(session, name :: initiators, required1, header.imports)
       }