Update explicit-failures-markup.xml

status/explicit-failures-markup.xml

@@ -6749,6 +6749,16 @@ This platform doesn't supports Boost.Container.
             a little inefficient.
         </note>
       </mark-expected-failures>
+
+      <mark-expected-failures>
+        <test name="compile_map_unordered_allocator"/>
+        <toolset name="msvc-7.1"/>
+        <note author="Daniel James">
+            This tests whether inserting elements creates as few copies as I think
+            is possible. If this fails it just means that the container might be
+            a little inefficient.
+        </note>
+      </mark-expected-failures>
     </library>
 
     <!-- utility/enable_if -->