From 570da3b51291e3a402fd46bface81227bd9ae3d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Wed, 23 Aug 2017 14:02:35 +0200
Subject: [PATCH] style: Assert that only servo passes in UA sheets explicitly.
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Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
---
 components/style/stylist.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 6c719169b9c..f096f80733b 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -119,6 +119,8 @@ impl DocumentCascadeData {
         }
 
         if let Some(ua_stylesheets) = ua_stylesheets {
+            debug_assert!(cfg!(feature = "servo"));
+
             for stylesheet in &ua_stylesheets.user_or_user_agent_stylesheets {
                 let sheet_origin =
                     stylesheet.contents(guards.ua_or_user).origin;