{pu : Lean.Compiler.LCNF.Purity} →
  {motive_4 : Lean.Compiler.LCNF.Code pu → Sort u} →
    (t : Lean.Compiler.LCNF.Code pu) →
      t.ctorIdx = 7 →
        ((fvarId : Lean.FVarId) →
            (i : ℕ) →
              (y : Lean.FVarId) →
                (k : Lean.Compiler.LCNF.Code pu) →
                  (h : pu = Lean.Compiler.LCNF.Purity.impure) →
                    motive_4 (Lean.Compiler.LCNF.Code.uset fvarId i y k h)) →
          motive_4 t