revset: made descgeneratorset a private class
This class is not supposed to be used outside revset.py since it only
wraps content that is used by baseset typed classes.
It only gets created by revset operations or private methods.
http://mercurial.selenic.com/bts/issue1175
$ hg init
$ touch a
$ hg ci -Am0
adding a
$ hg mv a a1
$ hg ci -m1
$ hg co 0
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg mv a a2
$ hg up
note: possible conflict - a was renamed multiple times to:
a2
a1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg ci -m2
$ touch a
$ hg ci -Am3
adding a
$ hg mv a b
$ hg ci -Am4 a
$ hg ci --debug --traceback -Am5 b
b
b: searching for copy revision for a
b: copy a:b80de5d138758541c5f05265ad144ab9fa86d1db
committed changeset 5:732aafbecb501a198b3cc9323ad3899ff04ccf95
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
4 files, 6 changesets, 4 total revisions
$ hg export --git tip
# HG changeset patch
# User test
# Date 0 0
# Thu Jan 01 00:00:00 1970 +0000
# Node ID 732aafbecb501a198b3cc9323ad3899ff04ccf95
# Parent 1d1625283f71954f21d14c3d44d0ad3c019c597f
5
diff --git a/b b/b
new file mode 100644