From 682a007d24ada56f2455b69a6977f780fca15d80 Mon Sep 17 00:00:00 2001
From: Cristian Kubis <cristian.kubis@tsunix.de>
Date: Fri, 10 Jul 2015 09:40:44 +0200
Subject: [PATCH] doc: set playground to nightly for unstable code

---
 src/librustdoc/html/static/playpen.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/librustdoc/html/static/playpen.js b/src/librustdoc/html/static/playpen.js
index ff947d93fca16..b7a5f202629fe 100644
--- a/src/librustdoc/html/static/playpen.js
+++ b/src/librustdoc/html/static/playpen.js
@@ -16,6 +16,7 @@ document.addEventListener('DOMContentLoaded', function() {
         return;
     }
 
+    var featureRegexp = new RegExp('^\s*#!\\[feature\\(\.*?\\)\\]');
     var elements = document.querySelectorAll('pre.rust');
 
     Array.prototype.forEach.call(elements, function(el) {
@@ -29,8 +30,14 @@ document.addEventListener('DOMContentLoaded', function() {
             a.setAttribute('class', 'test-arrow');
 
             var code = el.previousElementSibling.textContent;
+
+            var channel = '';
+            if (featureRegexp.test(code)) {
+                channel = '&version=nightly';
+            }
+
             a.setAttribute('href', window.playgroundUrl + '?code=' +
-                           encodeURIComponent(code));
+                           encodeURIComponent(code) + channel);
             a.setAttribute('target', '_blank');
 
             el.appendChild(a);