tests/test-histedit-bookmark-motion.t
author Martin von Zweigbergk <martinvonz@google.com>
Thu, 11 Apr 2019 23:22:54 -0700
changeset 42222 57203e0210f8
parent 35393 4441705b7111
child 46104 6f8a94bbfba1
permissions -rw-r--r--
copies: calculate mergecopies() based on pathcopies() When copies are stored in changesets, we need a changeset-centric version of mergecopies() just like we have a changeset-centric version of pathcopies(). I think the natural way of thinking about mergecopies() is in terms of pathcopies() from the base to each of the commits. So if we can rewrite mergecopies() based on two such pathcopies() calls, we'll get the changeset-centric version for free. That's what this patch does. A nice bonus is that it ends up being a lot simpler. mergecopies() has accumulated a lot of technical debt over time. One good example is the code for dealing with grafts (the "partial/incomplete/dirty" stuff). Since pathcopies() already deals with backwards renames and ping-pong renames, we get that for free. I've run tests with hard-coded debug logging for "fullcopy" and while I haven't looked at every difference it produces, all the ones I have looked at seemed reasonable to me. I'm a little surprised that no more tests fail when run with '--extra-config-opt experimental.copies.read-from=compatibility' compared to before this patch. This patch also fixes the broken cases in test-annotate.t and test-fastannotate.t. It also enables the part of test-copies.t that was previously disabled exactly because mergecopies() needed to get a changeset-centric version. One drawback of the rewritten code is that we may now make remotefilelog prefetch more files. We used to prefetch files that were unique to either side of the merge compared to the other. We now prefetch files that are unique to either side of the merge compared to the base. This means that if you added the same file to each side, we would not prefetch it before, but we would now. Such cases are probably quite rare, but one likely scenario where they happen is when moving from a commit to its successor (or the other way around). The user will probably already have the files in the cache in such cases, so it's probably not a big deal. Some timings for calculating mergecopies between two revisions (revisions shown on each line, all using the common ancestor as base): In the hg repo: 4.8 4.9: 0.21s -> 0.21s 4.0 4.8: 0.35s -> 0.63s In and old copy of the mozilla-unified repo: FIREFOX_BETA_60_BASE^ FIREFOX_BETA_60_BASE: 0.82s -> 0.82s FIREFOX_NIGHTLY_59_END FIREFOX_BETA_60_BASE: 2.5s -> 2.6s FIREFOX_BETA_59_END FIREFOX_BETA_60_BASE: 3.9s -> 4.1s FIREFOX_AURORA_50_BASE FIREFOX_BETA_60_BASE: 31s -> 33s So it's measurably slower in most cases. The most significant difference is in the hg repo between revisions 4.0 and 4.8. In that case it seems to come from the fact that pathcopies() uses fctx.isintroducedafter() (in _tracefile), while the old mergecopies() used fctx.linkrev() (in _checkcopies()). That results in a single call to filectx._adjustlinkrev(), which is responsible for the entire difference in time (in my repo). So we pay a performance penalty but we get more correct code (see change in test-mv-cp-st-diff.t). Deleting the "== f.filenode()" in _tracefile() recovers the lost performance in the hg repo. There were are few other optimizations in _checkcopies() that I could not measure any impact from. One was from the "seen" set. Another was from a "continue" when the file was not in the destination manifest (corresponding to "am" in _tracefile). Also note that merge copies are not calculated when updating with a clean working copy, which is probably the most common case. I therefore think the much simpler code is worth the slowdown. Differential Revision: https://phab.mercurial-scm.org/D6255
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  $ . "$TESTDIR/histedit-helpers.sh"
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  $ cat >> $HGRCPATH <<EOF
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  > [extensions]
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  > histedit=
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  > EOF
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  $ hg init r
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  $ cd r
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  $ for x in a b c d e f ; do
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  >     echo $x > $x
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  >     hg add $x
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  >     hg ci -m $x
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  > done
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  $ hg book -r 1 will-move-backwards
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  $ hg book -r 2 two
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  $ hg book -r 2 also-two
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  $ hg book -r 3 three
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  $ hg book -r 4 four
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  $ hg book -r tip five
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  $ hg log --graph
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  @  changeset:   5:652413bf663e
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  |  bookmark:    five
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  |  tag:         tip
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     f
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  |
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  o  changeset:   4:e860deea161a
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  |  bookmark:    four
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     e
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  |
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  o  changeset:   3:055a42cdd887
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  |  bookmark:    three
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     d
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  |
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  o  changeset:   2:177f92b77385
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  |  bookmark:    also-two
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  |  bookmark:    two
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     c
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  |
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  o  changeset:   1:d2ae7f538514
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  |  bookmark:    will-move-backwards
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     b
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  |
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  o  changeset:   0:cb9a9f314b8b
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     user:        test
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     date:        Thu Jan 01 00:00:00 1970 +0000
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     summary:     a
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  $ HGEDITOR=cat hg histedit 1
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  pick d2ae7f538514 1 b
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  pick 177f92b77385 2 c
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  pick 055a42cdd887 3 d
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  pick e860deea161a 4 e
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  pick 652413bf663e 5 f
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  # Edit history between d2ae7f538514 and 652413bf663e
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  #
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  # Commits are listed from least to most recent
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  #
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  # You can reorder changesets by reordering the lines
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  #
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  # Commands:
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  #
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  #  e, edit = use commit, but stop for amending
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  #  m, mess = edit commit message without changing commit content
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  #  p, pick = use commit
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  #  b, base = checkout changeset and apply further changesets from there
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  #  d, drop = remove commit from history
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  #  f, fold = use commit, but combine it with the one above
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  #  r, roll = like fold, but discard this commit's description and date
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  #
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  $ hg histedit 1 --commands - --verbose << EOF | grep histedit
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  > pick 177f92b77385 2 c
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  > drop d2ae7f538514 1 b
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  > pick 055a42cdd887 3 d
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  > fold e860deea161a 4 e
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  > pick 652413bf663e 5 f
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  > EOF
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  saved backup bundle to $TESTTMP/r/.hg/strip-backup/96e494a2d553-45c027ab-histedit.hg
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  $ hg log --graph
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  @  changeset:   3:cacdfd884a93
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  |  bookmark:    five
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  |  tag:         tip
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     f
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  |
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  o  changeset:   2:59d9f330561f
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  |  bookmark:    four
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  |  bookmark:    three
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     d
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  |
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  o  changeset:   1:b346ab9a313d
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  |  bookmark:    also-two
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  |  bookmark:    two
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     c
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  |
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  o  changeset:   0:cb9a9f314b8b
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     bookmark:    will-move-backwards
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     user:        test
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     date:        Thu Jan 01 00:00:00 1970 +0000
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     summary:     a
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  $ HGEDITOR=cat hg histedit 1
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  pick b346ab9a313d 1 c
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  pick 59d9f330561f 2 d
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  pick cacdfd884a93 3 f
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  # Edit history between b346ab9a313d and cacdfd884a93
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  #
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  # Commits are listed from least to most recent
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  #
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  # You can reorder changesets by reordering the lines
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  #
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  # Commands:
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  #
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  #  e, edit = use commit, but stop for amending
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  #  m, mess = edit commit message without changing commit content
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  #  p, pick = use commit
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  #  b, base = checkout changeset and apply further changesets from there
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  #  d, drop = remove commit from history
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  #  f, fold = use commit, but combine it with the one above
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  #  r, roll = like fold, but discard this commit's description and date
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  #
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  $ hg histedit 1 --commands - --verbose << EOF | grep histedit
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  > pick b346ab9a313d 1 c
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  > pick cacdfd884a93 3 f
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  > pick 59d9f330561f 2 d
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  > EOF
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  saved backup bundle to $TESTTMP/r/.hg/strip-backup/59d9f330561f-073008af-histedit.hg
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We expect 'five' to stay at tip, since the tipmost bookmark is most
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likely the useful signal.
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  $ hg log --graph
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  @  changeset:   3:c04e50810e4b
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  |  bookmark:    five
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  |  bookmark:    four
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  |  bookmark:    three
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  |  tag:         tip
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     d
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  |
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  o  changeset:   2:c13eb81022ca
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     f
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  |
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  o  changeset:   1:b346ab9a313d
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  |  bookmark:    also-two
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  |  bookmark:    two
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  |  user:        test
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  |  date:        Thu Jan 01 00:00:00 1970 +0000
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  |  summary:     c
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  |
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  o  changeset:   0:cb9a9f314b8b
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     bookmark:    will-move-backwards
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     user:        test
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     date:        Thu Jan 01 00:00:00 1970 +0000
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     summary:     a
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