function_30 won't work on vacpp because of a broken preprocessor

[SVN r24275]

status/explicit-failures-markup.xml

@@ -537,6 +537,12 @@ for more information.
                 <note refid="3" author="D. Gregor"/>
             </mark-failure>
         </test>
+        <test name="function_30">
+            <mark-failure>
+                <toolset name="vacpp"/>
+                <note refid="16" author="D. Gregor"/>
+            </mark-failure>
+        </test>
         <test name="function_arith_cxx98">
             <mark-failure>
                 <toolset name="borland"/>