Add specific never search

Author: GuillaumeGomez

src/librustdoc/html/static/main.js

@@ -1062,6 +1062,11 @@
                 type = matches[1].replace(/^const$/, 'constant');
                 query = query.substring(matches[0].length);
             }
+            // In case we just get a '!' as input, we can assume that the user is looking for the
+            // `Never` primitive type.
+            if (raw === '!') {
+                query = 'Never';
+            }
 
             return {
                 raw: raw,
@@ -1369,7 +1374,7 @@
 
         function search(e) {
             var params = getQueryStringParams();
-            var query = getQuery(document.getElementsByClassName('search-input')[0].value);
+            var query = getQuery(document.getElementsByClassName('search-input')[0].value.trim());
 
             if (e) {
                 e.preventDefault();

src/test/rustdoc-js/never.js

@@ -0,0 +1,17 @@
+// 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.
+
+const QUERY = '!';
+
+const EXPECTED = {
+    'others': [
+        { 'path': 'std', 'name': 'never' },
+    ],
+};