move core::hint::black_box under its own feature gate

[rust.git] / compiler / rustc_index / src / lib.rs

diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
index 3ced3920cfdfe82118fa0914c970dd0bf98c8b97..4036f4da1a76b6a475aba11e42c01bb4d4e3f1b8 100644 (file)
--- a/compiler/rustc_index/src/lib.rs
+++ b/compiler/rustc_index/src/lib.rs
@@ -1,4 +1,5 @@
 #![feature(allow_internal_unstable)]
+#![feature(bench_black_box)]
 #![feature(const_fn)]
 #![feature(const_panic)]
 #![feature(extend_one)]