change usages of type_of to bound_type_of

src/librustdoc/scrape_examples.rs

@@ -169,7 +169,7 @@ where
                 };
 
                 let ident_span = path.ident.span;
-                (tcx.type_of(def_id), call_span, ident_span)
+                (tcx.bound_type_of(def_id).subst_identity(), call_span, ident_span)
             }
             _ => {
                 return;