Bazaar experimental branch removal

[Guido Ostkamp]

Hello,

I've been reading through the Bazaar user guide (I'm new to Bazaar, but a 
bit familiar with Git and Mercurial).

It appears the "Mirror branch" concept described in chapter 6.2 in the 
user's guide will serve me best because I can save disk space if I use a 
top-level repository with a nested main mirror branch like with

   $ bzr init-repo X-repo
   $ cd X-repo
   $ bzr branch sftp://centralhost/srv/bzr/X-repo/X-trunk
   $ bzr branch X-trunk X-crazy-idea
   $ cd X-crazy-idea
     (hack, hack, hack)

Unfortunately I could not find info how I can get totally rid off such an 
'crazy-idea' branch and recover all the disk space required for any of its 
commits, when it becomes clear that the stuff will not be used any longer.

With 'git' I could easily use 'git branch -D X-crazy-idea'.

How can I do this with Bazaar?

It's clear to me that if I wouldn't use top-level repositories with nested 
branches, but two independent branches instead like

   $ cd /somewhere
   $ bzr branch sftp://centralhost/srv/bzr/X-repo/X-trunk
   $ bzr branch X-trunk X-crazy-idea

I could remove the 'X-crazy-idea' directory alltogether, but then I cannot 
save the space as 'X-crazy-idea' will need the same full copy of the 
project history as X-trunk, as long as it exists.

Thanks for any insight.

Regards

Guido