{pu : Lean.Compiler.LCNF.Purity} →
  {motive : Lean.Compiler.LCNF.CodeDecl pu → Sort u} →
    (t : Lean.Compiler.LCNF.CodeDecl pu) →
      t.ctorIdx = 3 →
        ((fvarId : Lean.FVarId) →
            (i : ℕ) →
              (y : Lean.FVarId) →
                (h : pu = Lean.Compiler.LCNF.Purity.impure) → motive (Lean.Compiler.LCNF.CodeDecl.uset fvarId i y h)) →
          motive t