Use allow_internal_unstable more in rustc_index

compiler/rustc_index/src/lib.rs

@@ -6,7 +6,6 @@
 #![feature(unboxed_closures)]
 #![feature(test)]
 #![feature(fn_traits)]
-#![feature(trusted_step)]
 
 pub mod bit_set;
 pub mod vec;

compiler/rustc_index/src/vec.rs

@@ -65,7 +65,7 @@ impl Idx for u32 {
 /// `u32::MAX`. You can also customize things like the `Debug` impl,
 /// what traits are derived, and so forth via the macro.
 #[macro_export]
-#[allow_internal_unstable(step_trait, rustc_attrs)]
+#[allow_internal_unstable(step_trait, rustc_attrs, trusted_step)]
 macro_rules! newtype_index {
     // ---- public rules ----
 

compiler/rustc_span/src/lib.rs

@@ -21,7 +21,6 @@
 #![feature(nll)]
 #![feature(min_specialization)]
 #![feature(thread_local_const_init)]
-#![feature(trusted_step)]
 
 #[macro_use]
 extern crate rustc_macros;