1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_query_impl/src/keys.rs b/compiler/rustc_query_impl/src/keys.rs
index 1fdb37398f9..27a0dc47682 100644
--- a/compiler/rustc_query_impl/src/keys.rs
+++ b/compiler/rustc_query_impl/src/keys.rs
@@ -21,6 +21,16 @@ pub trait Key {
     fn default_span(&self, tcx: TyCtxt<'_>) -> Span;
 }
 
+impl Key for () {
+    fn query_crate(&self) -> CrateNum {
+        LOCAL_CRATE
+    }
+
+    fn default_span(&self, _: TyCtxt<'_>) -> Span {
+        DUMMY_SP
+    }
+}
+
 impl<'tcx> Key for ty::InstanceDef<'tcx> {
     fn query_crate(&self) -> CrateNum {
         LOCAL_CRATE