1 files changed, 15 insertions, 7 deletions
diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
index 23a4c1f06..db2c79152 100644
--- a/compiler/rustc_index/src/lib.rs
+++ b/compiler/rustc_index/src/lib.rs
@@ -1,17 +1,25 @@
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
-#![feature(allow_internal_unstable)]
-#![feature(extend_one)]
-#![feature(min_specialization)]
-#![feature(new_uninit)]
-#![feature(step_trait)]
-#![feature(stmt_expr_attributes)]
-#![feature(test)]
+#![cfg_attr(
+    feature = "nightly",
+    feature(
+        allow_internal_unstable,
+        extend_one,
+        min_specialization,
+        new_uninit,
+        step_trait,
+        stmt_expr_attributes,
+        test
+    )
+)]
 
+#[cfg(feature = "nightly")]
 pub mod bit_set;
+#[cfg(feature = "nightly")]
 pub mod interval;
 pub mod vec;
 
+#[cfg(feature = "rustc_macros")]
 pub use rustc_macros::newtype_index;
 
 /// Type size assertion. The first argument is a type and the second argument is its expected size.