Add test for sidebar link generation

src/test/rustdoc/sidebar-link-generation.rs

@@ -0,0 +1,23 @@
+// Copyright 2014 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.
+
+#![crate_name = "foo"]
+
+// @has foo/struct.SomeStruct.html '//*[@class="sidebar-links"]/a[@href="#method.some_fn-1"]' \
+//          "some_fn"
+pub struct SomeStruct<T> { _inner: T }
+
+impl SomeStruct<()> {
+    pub fn some_fn(&self) {}
+}
+
+impl SomeStruct<usize> {
+    pub fn some_fn(&self) {}
+}