From 68470bef862f14501ff0d8a3a6ac78ea38ab383b Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 11 Aug 2017 09:21:09 +0900
Subject: Check method existence in `to_enum'; ref #3773

---
 mrbgems/mruby-enumerator/mrblib/enumerator.rb | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'mrbgems/mruby-enumerator')

diff --git a/mrbgems/mruby-enumerator/mrblib/enumerator.rb b/mrbgems/mruby-enumerator/mrblib/enumerator.rb
index c872ceedc..1e77af369 100644
--- a/mrbgems/mruby-enumerator/mrblib/enumerator.rb
+++ b/mrbgems/mruby-enumerator/mrblib/enumerator.rb
@@ -115,6 +115,9 @@ class Enumerator
     else
       raise ArgumentError unless obj
     end
+    if @obj and !self.respond_to?(meth)
+      raise NoMethodError, "undefined method #{meth}"
+    end
 
     @obj = obj
     @meth = meth
-- 
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