Implement existential types

src/librustc_save_analysis/lib.rs

@@ -749,6 +749,7 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
             HirDef::TyAlias(def_id) |
             HirDef::TyForeign(def_id) |
             HirDef::TraitAlias(def_id) |
+            HirDef::AssociatedExistential(def_id) |
             HirDef::AssociatedTy(def_id) |
             HirDef::Trait(def_id) |
             HirDef::Existential(def_id) |