--kill-last-command (-k) doesn't seem to work; not in bash's vi mode, not in bash's emacs mode

[emk2203]

I run bash in vi mode and I have the following lines in my .bashrc:

# if this is interactive shell, then bind hstr to Ctrl-r
if [[ $- =~ .*i.* ]]; then bind '"\C-r": "\e^i hstr -- \n"'; fi # vi mode

# if this is interactive shell, then bind 'kill last command' to Ctrl-k
if [[ $- =~ .*i.* ]]; then bind '"\C-k": "\e^i hstr -k \n"'; fi # vi  mode

The first line works as expected -- hstr -- (with a space prefix to keep it from history) which is run to show the menu.

The second line runs hstr -k the same way hstr -- runs, but nothing happens. The last history entry is still present.

EDIT: When manually set to set -o emacs, hstr -k doesn't work either.