def raise_rescue!
  [ 1 ].each do # removing block gets cause to be nil
    begin
      raise StandardError.new("err")
    rescue => e
      puts("ERROR #{e.object_id} #{e.cause ? print_cause(e) : 'nil cause'}")
      return # problematic 'early' return
    end
  end
end

def print_cause(e)
  cause = e.cause
  "cause: #{cause.object_id} #{cause.cause && print_cause(cause)}"
end

3.times do
  raise_rescue!
end