[libc++] Add missing include in test

diff --git a/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp b/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
index d60b3be..61cdc2f 100644 (file)
--- a/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
+++ b/libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp
@@ -12,8 +12,9 @@
 // Test that libc++ generates a warning diagnostic when the container is
 // provided a non-const callable comparator.
 
-#include <set>
 #include <map>
+#include <set>
+#include <type_traits> // for __invokable
 
 struct BadCompare {
   template <class T, class U>