1 error[E0658]: The attribute `a` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
2 --> $DIR/proc-macro-gates2.rs:13:11
4 LL | fn _test6<#[a] T>() {}
7 = help: add #![feature(custom_attribute)] to the crate attributes to enable
9 error[E0658]: The attribute `a` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
10 --> $DIR/proc-macro-gates2.rs:18:9
15 = help: add #![feature(custom_attribute)] to the crate attributes to enable
17 error: aborting due to 2 previous errors
19 For more information about this error, try `rustc --explain E0658`.