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  1. [4] pry(main)> ActiveRecord::Base.transaction do
  2. [4] pry(main)* User.first.update!(email: 'a@b.com')
  3. [4] pry(main)* ActiveRecord::Base.transaction do
  4. [4] pry(main)* User.first.update!(email: 'notvalidemail')
  5. [4] pry(main)* end
  6. [4] pry(main)* end
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