Add `Freeze` type and use it to store `Definitions`

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs
index c53a355b533..a86363b9cae 100644
--- a/compiler/rustc_session/src/cstore.rs
+++ b/compiler/rustc_session/src/cstore.rs
@@ -7,7 +7,7 @@ use crate::utils::NativeLibKind;
 use crate::Session;
 use rustc_ast as ast;
 use rustc_data_structures::owned_slice::OwnedSlice;
-use rustc_data_structures::sync::{self, AppendOnlyIndexVec, RwLock};
+use rustc_data_structures::sync::{self, AppendOnlyIndexVec, Freeze, RwLock};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, StableCrateId, LOCAL_CRATE};
 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash, Definitions};
 use rustc_span::hygiene::{ExpnHash, ExpnId};
@@ -261,5 +261,5 @@ pub struct Untracked {
     pub cstore: RwLock<Box<CrateStoreDyn>>,
     /// Reference span for definitions.
     pub source_span: AppendOnlyIndexVec<LocalDefId, Span>,
-    pub definitions: RwLock<Definitions>,
+    pub definitions: Freeze<Definitions>,
 }