[PATCH 3/6] t/close-has-env.ru: ensure close is idempotent

[Eric Wong <e@80x24.org>]

Ruby 2.3.0 will have idempotent IO#close, so closing an IO
twice will be idempotent and not raise an IOError exception.
Ensure we do not rely on the IOError exception to catch
our own errors.
---
 t/close-has-env.ru | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/close-has-env.ru b/t/close-has-env.ru
index 471f605..3b6ec88 100644
--- a/t/close-has-env.ru
+++ b/t/close-has-env.ru
@@ -10,6 +10,7 @@ class ClosablePipe < ::IO
   end
 
   def close
+    return if closed? # idempotent for Ruby 2.3.0 compatibility
     super
     $stdout.syswrite "path_info=#{@env['PATH_INFO']}\n"
   end
-- 
EW