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      1 Alert: field is MyField
      2 Alert: sub_a is MyField.Sub_A
      3 Alert: nonesuch is undefined
      4 Alert: found 4 sub-fields:
      5 Alert: MyField.Sub_A
      6 Alert: MyField.Sub_B
      7 Alert: MyField.Sub_X
      8 Alert: MyField.Sub_Z
      9