Run with RSpec mocks on Ruby 2.1 results in segfault. Run with `rspec test.rb`.

test.rb

module A
  def valid?(context)
    true
  end
end

module B
  def valid?(*args)
    super
  end
end

class C
  include A
  include B

  def save!
    return false unless valid? :create
    true
  end
end

describe C do
  let(:model) { C.new }

  describe 'save!' do
    subject { -> { model.save! } }

    it 'should validate with `create` context' do
      expect(model).to receive(:valid?).with(:create).and_call_original
      subject.call
    end
  end
end