1 error[E0658]: C-varaidic functions are unstable (see issue #44930)
2 --> $DIR/feature-gate-c_variadic.rs:3:1
4 LL | pub unsafe extern "C" fn test(_: i32, ap: ...) { }
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 = help: add #![feature(c_variadic)] to the crate attributes to enable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0658`.