{motive : Mathlib.Tactic.BicategoryLike.StructuralAtom → Sort u} →
  (t : Mathlib.Tactic.BicategoryLike.StructuralAtom) →
    t.ctorIdx = 3 →
      ((e : Lean.Expr) →
          (f : Mathlib.Tactic.BicategoryLike.Mor₁) → motive (Mathlib.Tactic.BicategoryLike.StructuralAtom.id e f)) →
        motive t