Rollup merge of #31835 - mitaa:rdoc-global-src, r=alexcrichton

fixes #26995

r? @alexcrichton

src/test/rustdoc/issue-26995.rs

@@ -0,0 +1,17 @@
+// Copyright 2016 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-windows
+// compile-flags: --no-defaults
+
+// @has src/issue_26995/dev/null.html
+// @has issue_26995/null/index.html '//a/@href' '../../src/issue_26995/dev/null.html'
+#[path="/dev/null"]
+pub mod null;