Ielm vs. ":"
Charles> I can no longer use ielm in b50.
Charles> Ielm uses the symbols `:', `::', and `:::' to refer to the results
of
Charles> the previous, second previous and third previous evaluations
Charles> respectively.
Charles> However in b50, doing (setq : nil) results in
Charles> Attempt to set a constant symbol: :, nil
A patch is already submitted for ielm which will fix this and command
reuse. It should be in one of the future betas.