Add more tests + visit_ty in some places

compiler/rustc_privacy/src/lib.rs

@@ -156,10 +156,10 @@ where
                 let leaf = leaf.subst(tcx, ct.substs);
                 self.visit_const(leaf)
             }
-            ACNode::Binop(..)
-            | ACNode::UnaryOp(..)
-            | ACNode::FunctionCall(_, _)
-            | ACNode::Cast(_, _, _) => ControlFlow::CONTINUE,
+            ACNode::Cast(_, _, ty) => self.visit_ty(ty),
+            ACNode::Binop(..) | ACNode::UnaryOp(..) | ACNode::FunctionCall(_, _) => {
+                ControlFlow::CONTINUE
+            }
         })
     }