Honestly it's kind of useful as a customized warning to callers. Callers can still ignore it by, for example (void)funcall_with_nodiscard(args). But they have t

Honestly it's kind of useful as a customized warning to callers. Callers can still ignore it by, for example (void)funcall_with_nodiscard(args). But they have to explicitly declare the intent to ignore the result. That seems like an all-around fair construct.