{motive : Lean.Elab.Term.StructInst.FieldLHS → Sort u} →
  (t : Lean.Elab.Term.StructInst.FieldLHS) →
    t.ctorIdx = 0 →
      ((ref : Lean.Syntax) → (name : Lean.Name) → motive (Lean.Elab.Term.StructInst.FieldLHS.fieldName ref name)) →
        motive t