report unused-value warning also for warn_unused types

llvm-svn: 186793

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-unused-value.cpp b/clang/test/SemaCXX/warn-unused-value.cpp
index 072ee60f1f3..5e43d3ec042 100644
--- a/clang/test/SemaCXX/warn-unused-value.cpp
+++ b/clang/test/SemaCXX/warn-unused-value.cpp
@@ -49,3 +49,23 @@ namespace test2 {
   }
 }
 
+namespace test3 {
+struct Used {
+  Used();
+  Used(int);
+  Used(int, int);
+};
+struct __attribute__((warn_unused)) Unused {
+  Unused();
+  Unused(int);
+  Unused(int, int);
+};
+void f() {
+  Used();
+  Used(1);
+  Used(1, 1);
+  Unused();     // expected-warning {{expression result unused}}
+  Unused(1);    // expected-warning {{expression result unused}}
+  Unused(1, 1); // expected-warning {{expression result unused}}
+}
+}