rustc_resolve: ignore uniform_paths canaries that resolve to an import of the same crate.

src/test/ui/rust-2018/uniform-paths-forward-compat/redundant.rs

@@ -0,0 +1,30 @@
+// Copyright 2018 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.
+
+// run-pass
+// edition:2018
+
+use std;
+use std::io;
+
+mod foo {
+    pub use std as my_std;
+}
+
+mod bar {
+    pub use std::{self};
+}
+
+fn main() {
+    io::stdout();
+    self::std::io::stdout();
+    foo::my_std::io::stdout();
+    bar::std::io::stdout();
+}

src/test/ui/rust-2018/uniform-paths/redundant.rs

@@ -8,11 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// run-pass
 // edition:2018
 
 #![feature(uniform_paths)]
 
 use std;
+use std::io;
 
 mod foo {
     pub use std as my_std;
@@ -23,6 +25,7 @@ mod bar {
 }
 
 fn main() {
+    io::stdout();
     self::std::io::stdout();
     foo::my_std::io::stdout();
     bar::std::io::stdout();