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error[E0658]: C-variadic functions are unstable
--> $DIR/feature-gate-c_variadic.rs:3:1 | LL | pub unsafe extern "C" fn test(_: i32, ap: ...) { } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
= note: see issue #44930 <https://github.com/rust-lang/rust/issues/44930> for more information
= help: add `#![feature(c_variadic)]` to the crate attributes to enable
error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.