Remove unused variable.

Ref: https://github.com/rack/rack/commit/812ac75b327c9f3d6ff5074def9721bf6f19e1de#commitcomment-425374

1 files changed, 0 insertions, 1 deletions

diff --git a/lib/rack/mock.rb b/lib/rack/mock.rb
index 04d27a61..4ebc4df1 100644
--- a/lib/rack/mock.rb
+++ b/lib/rack/mock.rb
@@ -163,7 +163,6 @@ module Rack
     def initialize(status, headers, body, errors=StringIO.new(""))
       @original_headers = headers
       @errors           = errors.string if errors.respond_to?(:string)
-      @body_string      = nil
 
       super(body, status, headers)
     end