[ruby-core:26090] [Bug #2212] Using a Lambda with Inappropriate Arity for Hash#default_proc=

Issue #2212 has been updated by Marc-Andre Lafortune.

Assigned to set to Yukihiro Matsumoto

There are other cases where Ruby C code calls user code. In particular with the new respond_to_missing? Example:

class A
   def respond_to_missing?(method, private)
     true
   end
   #....
end

A.new.method(:foo) # ==> valid method

A.new.respond_to?(:foo)  # ==> ArgumentError: wrong number of arguments (1 for 2)
	from (irb):1:in `respond_to?'

Although it's difficult to make an error when defining <=>, #sort and Comparable can give strange errors too if <=> has arity 0.
 
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http://redmine.ruby-lang.org/issues/show/2212

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