{
  ⟦
    org ↦ ⟦
      eolang ↦ ⟦
        error ↦ ⟦
          λ ⤍ Lorg_eolang_error,
          message ↦ ∅
        ⟧,
        λ ⤍ Package
      ⟧,
      λ ⤍ Package
    ⟧
  ⟧
}