1 files changed, 17 insertions, 0 deletions
diff --git a/compiler/rustc_hir/src/diagnostic_items.rs b/compiler/rustc_hir/src/diagnostic_items.rs
new file mode 100644
index 000000000..243014b00
--- /dev/null
+++ b/compiler/rustc_hir/src/diagnostic_items.rs
@@ -0,0 +1,17 @@
+use crate::def_id::DefId;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_span::Symbol;
+
+#[derive(Debug, Default)]
+pub struct DiagnosticItems {
+    pub id_to_name: FxHashMap<DefId, Symbol>,
+    pub name_to_id: FxHashMap<Symbol, DefId>,
+}
+
+impl<CTX: crate::HashStableContext> HashStable<CTX> for DiagnosticItems {
+    #[inline]
+    fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
+        self.name_to_id.hash_stable(ctx, hasher);
+    }
+}