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-rw-r--r--compiler/rustc_index/src/lib.rs22
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.