commit 05da5b0205aeada52a6838353d214db3723c79c7
author Marshall Clow <mclow.lists@gmail.com> Mon Oct 30 15:50:00 2017
committer Marshall Clow <mclow.lists@gmail.com> Mon Oct 30 15:50:00 2017
tree 2cc8e56888649ff4c4938cd9f475e40bdd6979c7
parent 4e13d4de52783dbdf9268a01055b546f5176947c

Fix PR#35119 : set_union misbehaves with move_iterators. Thanks to Denis Yaroshevskiy for both the bug report and the fix.

llvm-svn: 316914

libcxx/include/algorithm

diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
index 282083a..f5776b4 100644
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -5547,9 +5547,9 @@
         }
         else
         {
-            *__result = *__first1;
             if (!__comp(*__first1, *__first2))
                 ++__first2;
+            *__result = *__first1;
             ++__first1;
         }
     }