1 error[E0658]: the `#[needs_allocator]` attribute is an experimental feature
2 --> $DIR/feature-gate-needs-allocator.rs:1:1
4 LL | #![needs_allocator]
7 = help: add `#![feature(allocator_internals)]` to the crate attributes to enable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0658`.