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Bug #12907

closed

rb_respond_to() return value is incorrect

Added by ohler (Peter Ohler) over 7 years ago. Updated over 4 years ago.

Status:
Closed
Target version:
-
[ruby-core:78029]

Description

As of Ruby 2.3.0 rb_respond_to incorrectly reports non-zero for methods that are not supported. This occurs with subclasses of BasicObject. This occurs with Oj when but should occur with other C code. A simple sample that demonstrates the failure in below. It works fine on all versions of Ruby until 2.3.0.

require 'oj'

class A < BasicObject
  def initialize(data)
    @data = data
  end
end

a = A.new("xyz")

json = Oj.dump(a, mode: :compat, use_to_json: true)
#=> NoMethodError: undefined method `to_hash' for #<A:0x007fae03de1dc8>

In the C code the rb_respond_to() function is called to determine if an instance of A responds to "to_hash". 1 is returned in Ruby 2.3.x while previous versions correctly returned 0.

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