bookmark: prevent crashing when a successor is unknown locally (issue3680)
The `%ln` revset substitution does not accept unknown node. We prune unknown
node from potential successors before computing descendants.
This have no impact on the result of this function.
- Descendants of unknown changeset as unknown,
- all successors of unknown changesets are already return by the call who
returned those same unknown changesets,
- unknown changesets are never a valid destination for a bookmark.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing:
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.