d([ b)] for example. To save tedious keystrokes, it’s very convenient to redefine [ and ] so they provoke both the beam and the slur.
Alternatively, the slurs may be omitted as in the second example, to avoid misinterpretations (performers might take the slur as an indication for dynamics and articulation, even if it’s only intended to provide information on melismata) or to get a clearer, less crowded look.