I've accidentally done it when pulling some B&W direct reversal films, e.g. Kodak 2360 (the Estar version of 5360). To my eye, it just results in muddy washed out blacks. Which you could fix up a bit when printing...but you're probably not printing reversal film. Or which you could fix up a bit when scanning... but then it's not clear what the advantage is over negative films.
Originally Posted by Existing Light