From c3b8b3943755265f4680b063124752a3f59907cb Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Thu, 23 Jul 2015 11:21:05 +0200
Subject: [PATCH] An empty <declaration-value> is invalid.

---
 components/style/custom_properties.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/style/custom_properties.rs b/components/style/custom_properties.rs
index 63c4d15afa3..0992feac2d8 100644
--- a/components/style/custom_properties.rs
+++ b/components/style/custom_properties.rs
@@ -34,6 +34,10 @@ pub fn parse(input: &mut Parser) -> Result<Value, ()> {
 
 /// https://drafts.csswg.org/css-syntax-3/#typedef-declaration-value
 fn parse_declaration_value(input: &mut Parser, references: &mut HashSet<Atom>) -> Result<(), ()> {
+    if input.is_exhausted() {
+        // Need at least one token
+        return Err(())
+    }
     while let Ok(token) = input.next() {
         match token {
             Token::BadUrl |