Rollup merge of #49532 - Phlosioneer:32556-rustdoc-regression-test, r=GuillaumeGomez

Add test for rustdoc ignore test

This will check for regression on issue #32556

src/test/rustdoc/issue-32556.rs

@@ -0,0 +1,15 @@
+// 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.
+
+/// Blah blah blah
+/// ```ignore (testing rustdoc's handling of ignore)
+/// bad_assert!();
+/// ```
+pub fn foo() {}