Correctly walk import lists in AST visitors

src/test/compile-fail/issue-28075.rs

@@ -0,0 +1,22 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Unstable entities should be caught in import lists
+
+#![allow(unused_imports)]
+
+use std::thread::{catch_panic, sleep}; //~ ERROR use of unstable library feature 'catch_panic'
+//~^ ERROR use of unstable library feature 'thread_sleep'
+
+use std::rt::{self}; //~ ERROR use of unstable library feature 'rt'
+use std::rt::{};
+
+fn main() {
+}

src/test/compile-fail/lint-output-format.rs

@@ -14,7 +14,8 @@
 #![feature(foo)] //~ ERROR unused or unknown feature
 
 extern crate lint_output_format; //~ ERROR use of unstable library feature
-use lint_output_format::{foo, bar};
+use lint_output_format::{foo, bar}; //~ ERROR use of unstable library feature
+//~^ WARNING use of deprecated item,
 
 fn main() {
     let _x = foo(); //~ WARNING #[warn(deprecated)] on by default