2 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_hir/src/hir_id.rs b/compiler/rustc_hir/src/hir_id.rs
index dee391b9cce..f23e3ce1901 100644
--- a/compiler/rustc_hir/src/hir_id.rs
+++ b/compiler/rustc_hir/src/hir_id.rs
@@ -13,6 +13,7 @@ use std::fmt;
 /// the code base.
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 #[derive(Encodable, Decodable)]
+#[rustc_pass_by_value]
 pub struct HirId {
     pub owner: LocalDefId,
     pub local_id: ItemLocalId,
diff --git a/compiler/rustc_hir/src/lib.rs b/compiler/rustc_hir/src/lib.rs
index ba3eeb91fe9..d56230e1dc5 100644
--- a/compiler/rustc_hir/src/lib.rs
+++ b/compiler/rustc_hir/src/lib.rs
@@ -9,6 +9,7 @@
 #![feature(once_cell)]
 #![feature(min_specialization)]
 #![feature(never_type)]
+#![feature(rustc_attrs)]
 #![recursion_limit = "256"]
 
 #[macro_use]