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-enum-lazy/mrblib/lazy.rb | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'mrbgems/mruby-enum-lazy')

diff --git a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
index 8a7ac7fdc..c98681edf 100644
--- a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
+++ b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
@@ -43,6 +43,9 @@ class Enumerator
     end
 
     def to_enum(meth=:each, *args, &block)
+      unless self.respond_to?(meth)
+        raise NoMethodError, "undefined method #{meth}"
+      end
       lz = Lazy.new(self, &block)
       lz.obj = self
       lz.meth = meth
-- 
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