X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_trait_selection%2Fsrc%2Ftraits%2Fengine.rs;h=c028e89e4ea2963f093b48240a8f98ca613199d3;hb=ee6533d7408f1447c028025c883a34c904d25ba4;hp=3a05708aebc6c53c33416ea4a2e882fb503521c2;hpb=3539cf9344d3efb853751a17b520af35dcd5030b;p=rust.git

diff --git a/compiler/rustc_trait_selection/src/traits/engine.rs b/compiler/rustc_trait_selection/src/traits/engine.rs
index 3a05708aebc..c028e89e4ea 100644
--- a/compiler/rustc_trait_selection/src/traits/engine.rs
+++ b/compiler/rustc_trait_selection/src/traits/engine.rs
@@ -3,7 +3,7 @@
 
 use super::TraitEngine;
 use super::{ChalkFulfillmentContext, FulfillmentContext};
-use crate::infer::InferCtxtExt;
+use crate::traits::NormalizeExt;
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_infer::infer::at::ToTrace;
@@ -104,14 +104,32 @@ pub fn register_bound(
 
     pub fn normalize<T: TypeFoldable<'tcx>>(
         &self,
-        cause: ObligationCause<'tcx>,
+        cause: &ObligationCause<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
         value: T,
     ) -> T {
-        let infer_ok = self.infcx.partially_normalize_associated_types_in(cause, param_env, value);
+        let infer_ok = self.infcx.at(&cause, param_env).normalize(value);
         self.register_infer_ok_obligations(infer_ok)
     }
 
+    /// Makes `expected <: actual`.
+    pub fn eq_exp<T>(
+        &self,
+        cause: &ObligationCause<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+        a_is_expected: bool,
+        a: T,
+        b: T,
+    ) -> Result<(), TypeError<'tcx>>
+    where
+        T: ToTrace<'tcx>,
+    {
+        self.infcx
+            .at(cause, param_env)
+            .eq_exp(a_is_expected, a, b)
+            .map(|infer_ok| self.register_infer_ok_obligations(infer_ok))
+    }
+
     pub fn eq<T: ToTrace<'tcx>>(
         &self,
         cause: &ObligationCause<'tcx>,
@@ -185,7 +203,7 @@ pub fn assumed_wf_types(
             // sound and then uncomment this line again.
 
             // implied_bounds.insert(ty);
-            let normalized = self.normalize(cause.clone(), param_env, ty);
+            let normalized = self.normalize(&cause, param_env, ty);
             implied_bounds.insert(normalized);
         }
         implied_bounds