1 files changed, 20 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/query/type_op/subtype.rs b/compiler/rustc_trait_selection/src/traits/query/type_op/subtype.rs
new file mode 100644
index 000000000..57290b669
--- /dev/null
+++ b/compiler/rustc_trait_selection/src/traits/query/type_op/subtype.rs
@@ -0,0 +1,20 @@
+use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
+use crate::traits::query::Fallible;
+use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
+
+pub use rustc_middle::traits::query::type_op::Subtype;
+
+impl<'tcx> super::QueryTypeOp<'tcx> for Subtype<'tcx> {
+    type QueryResponse = ();
+
+    fn try_fast_path(_tcx: TyCtxt<'tcx>, key: &ParamEnvAnd<'tcx, Self>) -> Option<()> {
+        if key.value.sub == key.value.sup { Some(()) } else { None }
+    }
+
+    fn perform_query(
+        tcx: TyCtxt<'tcx>,
+        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
+    ) -> Fallible<CanonicalizedQueryResponse<'tcx, ()>> {
+        tcx.type_op_subtype(canonicalized)
+    }
+}