Get rid of some sub_exp and eq_exp

compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs

@@ -904,7 +904,6 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
             &ObligationCause::dummy(),
             param_env,
             hidden_ty,
-            true,
             &mut obligations,
         )?;
         self.add_goals(GoalSource::Misc, obligations.into_iter().map(|o| o.into()));

compiler/rustc_trait_selection/src/traits/engine.rs

@@ -116,24 +116,6 @@ impl<'a, 'tcx> ObligationCtxt<'a, 'tcx> {
         self.infcx.at(cause, param_env).deeply_normalize(value, &mut **self.engine.borrow_mut())
     }
 
-    /// 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(DefineOpaqueTypes::Yes, 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>,

compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs

@@ -1528,6 +1528,12 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                         | ObligationCauseCode::Coercion { .. }
                 );
 
+                let (expected, actual) = if is_normalized_term_expected {
+                    (normalized_term, data.term)
+                } else {
+                    (data.term, normalized_term)
+                };
+
                 // constrain inference variables a bit more to nested obligations from normalize so
                 // we can have more helpful errors.
                 //
@@ -1535,12 +1541,11 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                 // since the normalization is just done to improve the error message.
                 let _ = ocx.select_where_possible();
 
-                if let Err(new_err) = ocx.eq_exp(
+                if let Err(new_err) = ocx.eq(
                     &obligation.cause,
                     obligation.param_env,
-                    is_normalized_term_expected,
-                    normalized_term,
-                    data.term,
+                    expected,
+                    actual,
                 ) {
                     (Some((data, is_normalized_term_expected, normalized_term, data.term)), new_err)
                 } else {