obsolete: compute extinct changesets `extinct` changesets are obsolete changesets with obsolete descendants only. They are of no interest anymore and can be: - exclude from exchange - hidden to the user in most situation - safely garbage collected This changeset just allows mercurial to detect them. The implementation is a bit naive, as for unstable changesets. We better use a simple revset query and a cache, but simple version comes first.

push: refuse to push unstable changesets without force User should resolve unstability locally before pushing the same way we encourage user to merge locally instead of pushing a new remote head. If we are to push obsolete changeset, at least one set of the pushed set will be either obsolete or unstable. The check is narrowed to only heads.

obsolete: compute unstable changeset An unstable changeset is a changeset *not* obsolete but with some obsolete ancestors. The current logic to decide if a changeset is unstable is naive and very inefficient. A better solution is to compute the set of unstable changeset with a simple revset and to cache the result. But this require cache invalidation logic. Simpler version goes first.

revset: add an `obsolete` symbol This predicate matches obsolete changesets. This is a naive implementation to be improved later.

push: refuse to push obsolete changesets This is a first version. Simple but not very efficient. Note that this changeset introduce the "obsolete" word in the UI.

push: accept revset argument for --rev

check-code: recognise %= as an operator

tests: do exclude what is expected

parsers.c: remove warning: 'size' may be used uninitialized in this function Some compilers / compiler options (such as gcc 4.7) would emit warnings: mercurial/parsers.c: In function 'pack_dirstate': mercurial/parsers.c:306:18: warning: 'size' may be used uninitialized in this function [-Wmaybe-uninitialized] mercurial/parsers.c:306:12: warning: 'mode' may be used uninitialized in this function [-Wmaybe-uninitialized] It is apparently not smart enough to figure out how the 'err' arithmetics makes sure that it can't happen. 'err' is now replaced with simple checks and goto. That might also help the optimizer when it is inlining getintat().

graphlog: remove unused ASCIIDATA constant It was introduced by d9acbe7b0049, returned by asciiformat() but never read anywhere. 20140c249e63 stopped using it completely, and the graphmod.CHANGESET type is passed through all functions.