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src/Pure/Isar/toplevel.ML
changeset 29124 ce6f21913e54
parent 29122 b3bae49a013a
child 29343 43ac99cdeb5b 
--- a/src/Pure/Isar/toplevel.ML	Tue Dec 16 16:25:20 2008 +0100
+++ b/src/Pure/Isar/toplevel.ML	Tue Dec 16 18:04:16 2008 +0100
@@ -718,7 +718,7 @@
 
         val future_proof = Proof.future_proof
           (fn prf =>
-            Future.fork_pri ~1 (fn () =>
+            Future.fork_pri 1 (fn () =>
               let val (states, State (result_node, _)) =
                 (case st' of State (SOME (Proof (_, (_, orig_gthy)), exit), prev)
                   => State (SOME (Proof (ProofNode.init prf, (finish, orig_gthy)), exit), prev))
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