Should raise TypeError instead of NoMethodError

1 files changed, 6 insertions, 1 deletions

diff --git a/mrbgems/mruby-enum-ext/mrblib/enum.rb b/mrbgems/mruby-enum-ext/mrblib/enum.rb
index 96249db28..b4ac67a5b 100644
--- a/mrbgems/mruby-enum-ext/mrblib/enum.rb
+++ b/mrbgems/mruby-enum-ext/mrblib/enum.rb
@@ -768,7 +768,12 @@ module Enumerable
 
   def zip(*arg, &block)
     result = block ? nil : []
-    arg = arg.map{|a|a.to_a}
+    arg = arg.map do |a|
+      unless a.respond_to?(:to_a)
+        raise TypeError, "wrong argument type #{a.class} (must respond to :to_a)"
+      end
+      a.to_a
+    end
 
     i = 0
     self.each do |*val|