Add lint for intra link resolution failure

src/test/rustdoc-ui/deny-intra-link-resolution-failure.rs

@@ -0,0 +1,14 @@
+// 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.
+
+#![deny(intra_link_resolution_failure)]
+
+/// [v2] //~ ERROR
+pub fn foo() {}

src/test/rustdoc-ui/deny-intra-link-resolution-failure.stderr

@@ -0,0 +1,16 @@
+warning: [v2] cannot be resolved, ignoring it...
+  --> src/test/rustdoc-ui/deny-intra-link-resolution-failure.rs:13:1
+   |
+LL | /// [v2] //~ ERROR
+   | ^^^^^^^^^^^^^^^^^^
+   |
+note: lint level defined here
+  --> src/test/rustdoc-ui/deny-intra-link-resolution-failure.rs:11:9
+   |
+LL | #![deny(intra_link_resolution_failure)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: the link appears in this line:
+
+            [v2] //~ ERROR
+             ^^
+