1 // RUN: %clang_cc1 -std=c++1z -verify %s
2 
3 namespace std_example {
4   struct [[nodiscard]] error_info{
5     // ...
6   };
7 
8   error_info enable_missile_safety_mode();
9   void launch_missiles();
test_missiles()10   void test_missiles() {
11     enable_missile_safety_mode(); // expected-warning {{ignoring return value of function declared with 'nodiscard'}}
12     launch_missiles();
13   }
14 
15   error_info &foo();
f()16   void f() { foo(); } // no warning
17 }
18