From d62ab8891f3f2585160483c9bcfa752a8e5b3f8e Mon Sep 17 00:00:00 2001
From: yui-knk <spiketeika@gmail.com>
Date: Tue, 1 Apr 2014 08:21:31 +0900
Subject: [PATCH] Fix bug when used with pry-remote(drb environment).

See https://github.com/Mon-Ouie/pry-remote/issues/49 .
When we translate Proc object with drb, proc is wrapped with DRbObject.
In this case defined? proc.call is not delegated to proc self.
But proc.respond_to? :call is delegated to proc self.
So here it is better to check `proc.respond_to? :call`.
---
 lib/readline.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/readline.rb b/lib/readline.rb
index a835f07..0152448 100644
--- a/lib/readline.rb
+++ b/lib/readline.rb
@@ -89,7 +89,7 @@ def self.line_buffer
   #    Readline.completion_proc = proc{ |s| list.grep( /^#{Regexp.escape(s)}/) }
   #
   def self.completion_proc=(proc)
-    unless defined? proc.call
+    unless proc.respond_to? :call
       raise ArgumentError,"argument must respond to `call'"
     end
     @completion_proc = proc