rustc: implement fmt::{Debug,Display} on Ty instead of TyS.

src/librustc/util/ppaux.rs

@@ -1124,7 +1124,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 }
 
 define_print! {
-    ('tcx) ty::TyS<'tcx>, (self, f, cx) {
+    ('tcx) ty::Ty<'tcx>, (self, f, cx) {
         display {
             match self.sty {
                 Bool => write!(f, "bool"),

src/librustc_mir/util/graphviz.rs

@@ -141,7 +141,7 @@ fn write_graph_label<'a, 'gcx, 'tcx, W: Write>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
         )?;
     }
 
-    write!(w, ") -&gt; {}", escape(mir.return_ty()))?;
+    write!(w, ") -&gt; {}", escape(&mir.return_ty()))?;
     write!(w, r#"<br align="left"/>"#)?;
 
     for local in mir.vars_and_temps_iter() {

src/librustc_privacy/lib.rs

@@ -134,7 +134,7 @@ fn visit_ty(&mut self, ty: Ty<'tcx>) -> bool {
             ty::FnDef(def_id, ..) |
             ty::Closure(def_id, ..) |
             ty::Generator(def_id, ..) => {
-                if self.def_id_visitor.visit_def_id(def_id, "type", ty) {
+                if self.def_id_visitor.visit_def_id(def_id, "type", &ty) {
                     return true;
                 }
                 if self.def_id_visitor.shallow() {