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src/Pure/Concurrent/lazy.ML
changeset 66166 c88d1c36c9c3
parent 62923 3a122e1e352a
child 66167 1bd268ab885c 
--- a/src/Pure/Concurrent/lazy.ML	Wed Jun 21 22:57:40 2017 +0200
+++ b/src/Pure/Concurrent/lazy.ML	Thu Jun 22 14:27:13 2017 +0200
@@ -66,7 +66,7 @@
           val (expr, x) =
             Synchronized.change_result var
               (fn Expr e =>
-                    let val x = Future.promise I
+                    let val x = Future.promise_name "lazy" I
                     in ((SOME e, x), Result x) end
                 | Result x => ((NONE, x), Result x));
         in
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