Add test for associated const version display

Author: GuillaumeGomez

src/test/rustdoc/assoc-consts-version.rs

@@ -0,0 +1,26 @@
+// 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.
+
+// ignore-tidy-linelength
+
+#![crate_name = "foo"]
+
+#![feature(staged_api)]
+
+#![stable(since="1.1.1", feature="rust1")]
+
+#[stable(since="1.1.1", feature="rust1")]
+pub struct SomeStruct;
+
+impl SomeStruct {
+    // @has 'foo/struct.SomeStruct.html' '//*[@id="SOME_CONST.v"]//div[@class="since"]' '1.1.2'
+    #[stable(since="1.1.2", feature="rust2")]
+    pub const SOME_CONST: usize = 0;
+}