[Gretl-devel] Re: Optional arguments (in user-defined hansl functions) and nested function calls

Am 22.03.2023 um 10:19 schrieb Sven Schreiber: One addendum to this problem, based on real-world code: It is not unusual that there is a middle function layer before the bcheck() function comes into play. In a stripped-down pseudo example: <hansl> function void toplevel (matrix myinput, bundle options[null])     matrix someneededstuff = middlelayer(options) # fails when options is absent     # then continue to act on myinput and someneededstuff end function # function matrix middlelayer (bundle options[null])     bundle defaults = _(x = 1)     if exists(options)         bcheck(&defaults, options)     endif     # here one would do some useful stuff     return mshape(defaults.x, 2,2)    # just a placeholder end function # toplevel(I(2)) </hansl> This example will currently fail at the first line inside toplevel(), even though the bundle arg is marked as optional at all function levels! Sure, one can insert more checking code with exists(), and that is currently the workaround. But does it have to be that way forever? thanks sven