1 error[E0658]: the `#[ffi_returns_twice]` attribute is an experimental feature
2 --> $DIR/feature-gate-ffi_returns_twice.rs:4:5
4 LL | #[ffi_returns_twice]
7 = note: see issue #58314 <https://github.com/rust-lang/rust/issues/58314> for more information
8 = help: add `#![feature(ffi_returns_twice)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.