From 5baebb0d44361dc265b9600f57fb27d059d5a739 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Fri, 6 Feb 2015 09:07:55 +1100
Subject: [PATCH] Requires at least one function in `filter` parsing.

---
 components/style/properties.mako.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/style/properties.mako.rs b/components/style/properties.mako.rs
index 4ac7f6902de..c50d0a852fe 100644
--- a/components/style/properties.mako.rs
+++ b/components/style/properties.mako.rs
@@ -1790,6 +1790,8 @@ pub mod longhands {
                             _ => Err(())
                         }
                     })));
+                } else if filters.is_empty() {
+                    return Err(())
                 } else {
                     return Ok(SpecifiedValue::new(filters))
                 }