1 error[E0658]: the `linkage` attribute is experimental and not portable across platforms
2 --> $DIR/linkage4.rs:1:1
4 LL | #[linkage = "external"]
5 | ^^^^^^^^^^^^^^^^^^^^^^^
7 = note: see issue #29603 <https://github.com/rust-lang/rust/issues/29603> for more information
8 = help: add `#![feature(linkage)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.