error[E0658]: use of unstable library feature 'function' --> $DIR/internal-unstable.rs:40:25 | LL | pass_through_allow!(internal_unstable::unstable()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(function)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'function' --> $DIR/internal-unstable.rs:42:27 | LL | pass_through_noallow!(internal_unstable::unstable()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(function)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'function' --> $DIR/internal-unstable.rs:46:22 | LL | println!("{:?}", internal_unstable::unstable()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(function)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'function' --> $DIR/internal-unstable.rs:48:10 | LL | bar!(internal_unstable::unstable()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(function)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'function' --> $DIR/internal-unstable.rs:18:9 | LL | internal_unstable::unstable(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ... LL | bar!(internal_unstable::unstable()); | ----------------------------------- in this macro invocation | = help: add `#![feature(function)]` to the crate attributes to enable = note: this error originates in the macro `foo` which comes from the expansion of the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0658`.