{motive : Lean.Elab.Command.Structure.StructFieldViewDefault → Sort u} →
  (t : Lean.Elab.Command.Structure.StructFieldViewDefault) →
    t.ctorIdx = 1 →
      ((tactic : Lean.Syntax) → motive (Lean.Elab.Command.Structure.StructFieldViewDefault.autoParam tactic)) → motive t