1 files changed, 10 insertions, 2 deletions
diff --git a/compiler/rustc_middle/src/ty/assoc.rs b/compiler/rustc_middle/src/ty/assoc.rs
index cce609c26..f77a8c671 100644
--- a/compiler/rustc_middle/src/ty/assoc.rs
+++ b/compiler/rustc_middle/src/ty/assoc.rs
@@ -84,14 +84,22 @@ impl AssocItem {
                 // late-bound regions, and we don't want method signatures to show up
                 // `as for<'r> fn(&'r MyType)`. Pretty-printing handles late-bound
                 // regions just fine, showing `fn(&MyType)`.
-                tcx.fn_sig(self.def_id).subst_identity().skip_binder().to_string()
+                tcx.fn_sig(self.def_id).instantiate_identity().skip_binder().to_string()
             }
             ty::AssocKind::Type => format!("type {};", self.name),
             ty::AssocKind::Const => {
-                format!("const {}: {:?};", self.name, tcx.type_of(self.def_id).subst_identity())
+                format!(
+                    "const {}: {:?};",
+                    self.name,
+                    tcx.type_of(self.def_id).instantiate_identity()
+                )
             }
         }
     }
+
+    pub fn is_impl_trait_in_trait(&self) -> bool {
+        self.opt_rpitit_info.is_some()
+    }
 }
 
 #[derive(Copy, Clone, PartialEq, Debug, HashStable, Eq, Hash, Encodable, Decodable)]