Argument "-o nospace" of compgen isn't work?

[yhun...@gmail.com]

Is argument "-o nospace" of compgen not work?

I write a simple script for auto-completion as following,
-------------
_cooltool()
{
local cur=${COMP_WORDS[COMP_CWORD]}
COMPREPLY=( $(compgen -o nospace -W "fooOption barOption" -- $cur) )
}
complete -F _cooltool cooltool
-------------

When I type following command in terminal,
$ cooltool ba<tab>

It will become
$ cooltool barOption<space>|

However, I don't hope a space appear at end of line as following
The expected condition should be
$ cooltool barOption|

Is there something wrong for using of "compgen -o nospace" by me?
Do you all have any idea?

Thanks all.