Index: libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
===================================================================
--- libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
+++ libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
@@ -329,6 +329,7 @@
     doAppendSourceTest<char32_t>(TC);
   }
   for (auto const & TC : LongLHSCases) {
+    (void)TC;
     LIBCPP_ONLY(doAppendSourceAllocTest<char>(TC));
     LIBCPP_ONLY(doAppendSourceAllocTest<wchar_t>(TC));
   }