error[E0106]: missing lifetime specifier
  --> $DIR/variadic-ffi-6.rs:7:6
   |
LL | ) -> &usize {
   |      ^ help: consider giving it an explicit bounded or 'static lifetime: `&'static`
   |
   = help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments

error: aborting due to previous error

For more information about this error, try `rustc --explain E0106`.