bzr hooks shows no name for lazy installed hooks

Consider the very simple plugin:

"""Test plugin"""

from bzrlib.hooks import install_lazy_named_hook

def callable():
    pass

install_lazy_named_hook('bzrlib.branch','Branch.hooks',
                        'post_branch_init', callable, 'My name is mud')

The relevant portion of the output of "bzr hooks" does not include the string "My name is mud" anywhere:

$ BZR_PLUGINS_AT=test@. bzr hooks
BranchHooks:
  automatic_tag_name:
    <no hooks installed>
  open:
    package-branch-up-to-date
  post_branch_init:
    No hook name
    No hook name
    No hook name
  post_change_branch_tip:
...

"No hook name" is shown thrice (for three plugins that install post_branch_init hooks), but I gave a name when I called install_lazy_named_hook. That name not being shown is the bug. The name is also not shown if the plugin calls bzrlib.branch.Branch.hooks.install_named_hook_lazy(). It *is* shown if we call bzrlib.branch.Branch.hooks.install_named_hook().

I can see where Hooks.hook_lazy() can't call name_hook because it doesn't have a callable to use as the key in self._callable_names, but can't we have self._lazy_callable_names with keys of (callback_module, callback_member)? We could try that dict as well in Hooks.get_hook_name().