1 files changed, 13 insertions, 0 deletions
diff --git a/test/Modules/Inputs/PR20399/stl_map.h b/test/Modules/Inputs/PR20399/stl_map.h
new file mode 100644
index 0000000000000..334f8b308f405
--- /dev/null
+++ b/test/Modules/Inputs/PR20399/stl_map.h
@@ -0,0 +1,13 @@
+namespace std {
+struct reverse_iterator {};
+
+inline void
+operator-(int __x, reverse_iterator __y) {}
+
+template <typename _Key>
+struct map {
+  typedef int iterator;
+
+  friend bool operator<(const map &, const map &);
+};
+} // namespace std