error[E0658]: `cfg(target_thread_local)` is experimental and subject to change --> $DIR/feature-gate-cfg-target-thread-local.rs:9:16 | LL | #[cfg_attr(target_thread_local, thread_local)] | ^^^^^^^^^^^^^^^^^^^ | = note: see issue #29594 for more information = help: add `#![feature(cfg_target_thread_local)]` to the crate attributes to enable error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0658`.