Regardless of 'Regs' or your rating, if unprepared for total darkness and you're down amongst the weeds - not much fun!
I was 10,000' over Mount Gambier for the (1976 I think) eclipse and apart from the rim of light around the horizon - as dark as a moonless night.
Amazing watching that circle of darkness sweep across the land towards you, and then away after the few minutes.
One of aviation's best experiences.