A stackful coroutine is a normal function that can be suspended during execution.

Folks around here 18 or 20 years ago who belonged to the writers' and poetry clubs and listened to a handsome, virile, teller of tales named Louis L'Amour, may be glad to know Louie seems to have caught up in Hollywood with some of that green, folding stuff he started reaching for long ago.

Oh, miss! if you only heard the poor hanimals ’owling, you’d pity them.

She biased them against him for no apparent reason.