If you want to try out those features now, I made a pre-processor that translates that into standard C99:
https://sentido-labs.com/en/library/cedro/202106171400/use-e...
https://sentido-labs.com/en/library/cedro/202106171400/#numb...
It includes a cc wrapper called cedrocc that you can use as a drop-in replacement:
https://sentido-labs.com/en/library/cedro/202106171400/#cedr...