Hello,
In SLIME, I was used to use the key C-c-C-u which was bound to the command
slime-repl-kill-input
In recent versions, this command exists but is no longer bound to any key;
(it is however accessible from the REPL menu).
And the key C-c C-u is bound to the command
slime-undefine-function (fmakunbound) which confuses me each time
I hit C-c-C-u.
Of course, I can myself make the binding to some unused key, but I think
that such a useful and frequenlty used command should be, by default,
bound to a convenient key.
Regards,
Irène