From 3e75ea282123c62eb8cebef0b9741b482da20906 Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman@gmail.com>
Date: Tue, 14 Nov 2017 16:19:18 -0600
Subject: [PATCH] Index into `source` instead of `buf`

So we can take advantage of the UTF32 encoding.
---
 lib/sprockets/utils.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sprockets/utils.rb b/lib/sprockets/utils.rb
index 1233b78f7..bb0c68d71 100644
--- a/lib/sprockets/utils.rb
+++ b/lib/sprockets/utils.rb
@@ -106,7 +106,7 @@ def concat_javascript_sources(buf, source)
       source = source.encode(Encoding::UTF_32LE) unless source.ascii_only?
       return buf if string_end_with_semicolon?(source)
 
-      if whitespace = WHITESPACE_ORDINALS[buf[-1].ord]
+      if whitespace = WHITESPACE_ORDINALS[source[-1].ord]
         buf[-1] = ";#{whitespace}"
       else
         buf << ";"