error: `proc-macro` crate types currently cannot export any items other than functions tagged with `#[proc_macro]`, `#[proc_macro_derive]`, or `#[proc_macro_attribute]` --> $DIR/pub-at-crate-root.rs:8:1 | LL | pub mod a { | ^^^^^^^^^ error: functions tagged with `#[proc_macro_derive]` must currently reside in the root of the crate --> $DIR/pub-at-crate-root.rs:12:5 | LL | pub fn bar(a: TokenStream) -> TokenStream { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: functions tagged with `#[proc_macro_derive]` must be `pub` --> $DIR/pub-at-crate-root.rs:19:1 | LL | fn bar(a: proc_macro::TokenStream) -> proc_macro::TokenStream { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 3 previous errors