From a191d664e9ef78d0b413c349c8608148cc2e455d Mon Sep 17 00:00:00 2001
From: xzyfer <xzyfer@gmail.com>
Date: Wed, 7 Jan 2015 16:57:43 +1100
Subject: [PATCH] str-slice() $end-at should default to -1 if omitted

---
 functions.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/functions.cpp b/functions.cpp
index 737b3b885b..c824f94070 100644
--- a/functions.cpp
+++ b/functions.cpp
@@ -904,7 +904,10 @@ namespace Sass {
 
         // `str-slice` should always return an empty string when $end-at == 0
         // `normalize_index` normalizes 1 -> 0 so we need to check the original value
-        if(start == end && m->value() > 0) {
+        if(m->value() == 0) {
+          if(!quotemark) return new (ctx.mem) Null(pstate);
+          newstr = "";
+        } else if(start == end && m->value() > 0) {
           newstr = str.substr(start, 1);
         } else if(end > start) {
           newstr = str.substr(start, end - start + UTF_8::code_point_size_at_offset(str, end));