Backed out changeset 1bc422c08209 -- obsolete in AFP/5d11846ac6ab;

--- a/src/Pure/Isar/toplevel.ML	Tue Jan 22 17:57:19 2019 +0100
+++ b/src/Pure/Isar/toplevel.ML	Tue Jan 22 19:36:17 2019 +0100
@@ -749,6 +749,5 @@
 end;
 
 end;
-(* FIXME
+
 structure Local_Theory : LOCAL_THEORY = struct open Local_Theory; end;
-*)