var args = v.varargize(callsite.mpropdef, recv, self.n_args.n_exprs)
if args == null then return null
var res2 = v.callsite(callsite, args)
var args = v.varargize(callsite.mpropdef, recv, self.n_args.n_exprs)
if args == null then return null
var res2 = v.callsite(callsite, args)