d3m1gd

class Dbg
  new create
    ( a1: Stringable
    , a2:(Stringable | None) = None
    , a3:(Stringable | None) = None
    , a4:(Stringable | None) = None
    ) =>
      let cs1 = a1.string().cstring()
      let cs2 = match a2 | var z: None box => "".cstring() else a2.string().cstring() end
      let cs3 = match a3 | var z: None box => "".cstring() else a3.string().cstring() end