Mercurial > hg
view tests/test-rebase-inmemory.t @ 44396:acbfa31cfaf2
debugmergestate: make templated
Our IntelliJ team wants to be able to read the merge state in order to
help the user resolve merge conflicts. They had so far been reading
file contents from p1() and p2() and their merge base. That is not
ideal for several reasons (merge base is not necessarily the "graft
base", renames are not handled, commands like `hg update -m` is not
handled). It will get especially bad as of my D7827. This patch makes
the output s a templated. I haven't bothered to make it complete
(e.g. merge driver states are not handled), but it's probably good
enough as a start.
I've done a web search for "debugmergestate" and I can't find any
indication that any tools currently rely on its output. If it turns
out that we get bug reports for it once this is released, I won't
object to backing this patch out on the stable branch (and then
perhaps replace it by a separate command, or put it behind a new
flag).
The changes in test-backout.t are interesting, in particular this:
```
- other path: foo (node not stored in v1 format)
+ other path: (node foo)
```
I wonder if that means that we actually read v1 format
incorrectly. That seems to be an old format that was switched away
from in 2014, so it doesn't matter now anyway.
Differential Revision: https://phab.mercurial-scm.org/D8120
author | Martin von Zweigbergk <martinvonz@google.com> |
---|---|
date | Thu, 13 Feb 2020 21:14:20 -0800 |
parents | 905b21783968 |
children | ab33782deb84 |
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#require symlink execbit $ cat << EOF >> $HGRCPATH > [phases] > publish=False > [extensions] > amend= > rebase= > debugdrawdag=$TESTDIR/drawdag.py > strip= > [rebase] > experimental.inmemory=1 > [diff] > git=1 > [alias] > tglog = log -G --template "{rev}: {node|short} '{desc}'\n" > EOF Rebase a simple DAG: $ hg init repo1 $ cd repo1 $ hg debugdrawdag <<'EOS' > c b > |/ > d > | > a > EOS $ hg up -C a 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg tglog o 3: 814f6bd05178 'c' | | o 2: db0e82a16a62 'b' |/ o 1: 02952614a83d 'd' | @ 0: b173517d0057 'a' $ hg cat -r 3 c c (no-eol) $ hg cat -r 2 b b (no-eol) $ hg rebase --debug -r b -d c | grep rebasing rebasing in-memory rebasing 2:db0e82a16a62 "b" (b) $ hg tglog o 3: ca58782ad1e4 'b' | o 2: 814f6bd05178 'c' | o 1: 02952614a83d 'd' | @ 0: b173517d0057 'a' $ hg cat -r 3 b b (no-eol) $ hg cat -r 2 c c (no-eol) $ cd .. Case 2: $ hg init repo2 $ cd repo2 $ hg debugdrawdag <<'EOS' > c b > |/ > d > | > a > EOS Add a symlink and executable file: $ hg up -C c 3 files updated, 0 files merged, 0 files removed, 0 files unresolved $ ln -s somefile e $ echo f > f $ chmod +x f $ hg add e f $ hg amend -q $ hg up -Cq a Write files to the working copy, and ensure they're still there after the rebase $ echo "abc" > a $ ln -s def b $ echo "ghi" > c $ echo "jkl" > d $ echo "mno" > e $ hg tglog o 3: f56b71190a8f 'c' | | o 2: db0e82a16a62 'b' |/ o 1: 02952614a83d 'd' | @ 0: b173517d0057 'a' $ hg cat -r 3 c c (no-eol) $ hg cat -r 2 b b (no-eol) $ hg cat -r 3 e somefile (no-eol) $ hg rebase --debug -s b -d a | grep rebasing rebasing in-memory rebasing 2:db0e82a16a62 "b" (b) $ hg tglog o 3: fc055c3b4d33 'b' | | o 2: f56b71190a8f 'c' | | | o 1: 02952614a83d 'd' |/ @ 0: b173517d0057 'a' $ hg cat -r 2 c c (no-eol) $ hg cat -r 3 b b (no-eol) $ hg rebase --debug -s 1 -d 3 | grep rebasing rebasing in-memory rebasing 1:02952614a83d "d" (d) rebasing 2:f56b71190a8f "c" $ hg tglog o 3: 753feb6fd12a 'c' | o 2: 09c044d2cb43 'd' | o 1: fc055c3b4d33 'b' | @ 0: b173517d0057 'a' Ensure working copy files are still there: $ cat a abc $ readlink.py b b -> def $ cat e mno Ensure symlink and executable files were rebased properly: $ hg up -Cq 3 $ readlink.py e e -> somefile $ ls -l f | cut -c -10 -rwxr-xr-x Rebase the working copy parent $ hg up -C 3 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg rebase -r 3 -d 0 --debug | grep rebasing rebasing in-memory rebasing 3:753feb6fd12a "c" (tip) $ hg tglog @ 3: 844a7de3e617 'c' | | o 2: 09c044d2cb43 'd' | | | o 1: fc055c3b4d33 'b' |/ o 0: b173517d0057 'a' Test reporting of path conflicts $ hg rm a $ mkdir a $ touch a/a $ hg ci -Am "a/a" adding a/a $ hg tglog @ 4: daf7dfc139cb 'a/a' | o 3: 844a7de3e617 'c' | | o 2: 09c044d2cb43 'd' | | | o 1: fc055c3b4d33 'b' |/ o 0: b173517d0057 'a' $ hg rebase -r . -d 2 rebasing 4:daf7dfc139cb "a/a" (tip) saved backup bundle to $TESTTMP/repo2/.hg/strip-backup/daf7dfc139cb-fdbfcf4f-rebase.hg $ hg tglog @ 4: c6ad37a4f250 'a/a' | | o 3: 844a7de3e617 'c' | | o | 2: 09c044d2cb43 'd' | | o | 1: fc055c3b4d33 'b' |/ o 0: b173517d0057 'a' $ echo foo > foo $ hg ci -Aqm "added foo" $ hg up '.^' 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo bar > bar $ hg ci -Aqm "added bar" $ hg rm a/a $ echo a > a $ hg ci -Aqm "added a back!" $ hg tglog @ 7: 855e9797387e 'added a back!' | o 6: d14530e5e3e6 'added bar' | | o 5: 9b94b9373deb 'added foo' |/ o 4: c6ad37a4f250 'a/a' | | o 3: 844a7de3e617 'c' | | o | 2: 09c044d2cb43 'd' | | o | 1: fc055c3b4d33 'b' |/ o 0: b173517d0057 'a' $ hg rebase -r . -d 5 rebasing 7:855e9797387e "added a back!" (tip) saved backup bundle to $TESTTMP/repo2/.hg/strip-backup/855e9797387e-81ee4c5d-rebase.hg $ hg tglog @ 7: bb3f02be2688 'added a back!' | | o 6: d14530e5e3e6 'added bar' | | o | 5: 9b94b9373deb 'added foo' |/ o 4: c6ad37a4f250 'a/a' | | o 3: 844a7de3e617 'c' | | o | 2: 09c044d2cb43 'd' | | o | 1: fc055c3b4d33 'b' |/ o 0: b173517d0057 'a' $ mkdir -p c/subdir $ echo c > c/subdir/file.txt $ hg add c/subdir/file.txt $ hg ci -m 'c/subdir/file.txt' $ hg rebase -r . -d 3 -n starting dry-run rebase; repository will not be changed rebasing 8:e147e6e3c490 "c/subdir/file.txt" (tip) abort: error: 'c/subdir/file.txt' conflicts with file 'c' in 3. [255] FIXME: shouldn't need this, but when we hit path conflicts in dryrun mode, we don't clean up rebasestate. $ hg rebase --abort rebase aborted $ hg rebase -r 3 -d . -n starting dry-run rebase; repository will not be changed rebasing 3:844a7de3e617 "c" abort: error: file 'c' cannot be written because 'c/' is a directory in e147e6e3c490 (containing 1 entries: c/subdir/file.txt) [255] $ cd .. Test path auditing (issue5818) $ mkdir lib_ $ ln -s lib_ lib $ hg init repo $ cd repo $ mkdir -p ".$TESTTMP/lib" $ touch ".$TESTTMP/lib/a" $ hg add ".$TESTTMP/lib/a" $ hg ci -m 'a' $ touch ".$TESTTMP/lib/b" $ hg add ".$TESTTMP/lib/b" $ hg ci -m 'b' $ hg up -q '.^' $ touch ".$TESTTMP/lib/c" $ hg add ".$TESTTMP/lib/c" $ hg ci -m 'c' created new head $ hg rebase -s 1 -d . rebasing 1:* "b" (glob) saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-rebase.hg (glob) $ cd .. Test dry-run rebasing $ hg init repo3 $ cd repo3 $ echo a>a $ hg ci -Aqma $ echo b>b $ hg ci -Aqmb $ echo c>c $ hg ci -Aqmc $ echo d>d $ hg ci -Aqmd $ echo e>e $ hg ci -Aqme $ hg up 1 -q $ echo f>f $ hg ci -Amf adding f created new head $ echo g>g $ hg ci -Aqmg $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Make sure it throws error while passing --continue or --abort with --dry-run $ hg rebase -s 2 -d 6 -n --continue abort: cannot specify both --continue and --dry-run [255] $ hg rebase -s 2 -d 6 -n --abort abort: cannot specify both --abort and --dry-run [255] Check dryrun gives correct results when there is no conflict in rebasing $ hg rebase -s 2 -d 6 -n starting dry-run rebase; repository will not be changed rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase $ hg diff $ hg status $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Check dryrun working with --collapse when there is no conflict $ hg rebase -s 2 -d 6 -n --collapse starting dry-run rebase; repository will not be changed rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase Check dryrun gives correct results when there is conflict in rebasing Make a conflict: $ hg up 6 -q $ echo conflict>e $ hg ci -Aqm "conflict with e" $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 7:d2c195b28050 test | conflict with e | o 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a $ hg rebase -s 2 -d 7 -n starting dry-run rebase; repository will not be changed rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" merging e transaction abort! rollback completed hit a merge conflict [1] $ hg diff $ hg status $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 7:d2c195b28050 test | conflict with e | o 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Check dryrun working with --collapse when there is conflicts $ hg rebase -s 2 -d 7 -n --collapse starting dry-run rebase; repository will not be changed rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" merging e hit a merge conflict [1] In-memory rebase that fails due to merge conflicts $ hg rebase -s 2 -d 7 rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" merging e transaction abort! rollback completed hit merge conflicts; re-running rebase without in-memory merge rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" merging e warning: conflicts while merging e! (edit, then use 'hg resolve --mark') unresolved conflicts (see hg resolve, then hg rebase --continue) [1] $ hg rebase --abort saved backup bundle to $TESTTMP/repo3/.hg/strip-backup/c1e524d4287c-f91f82e1-backup.hg rebase aborted Retrying without in-memory merge won't lose working copy changes $ cd .. $ hg clone repo3 repo3-dirty -q $ cd repo3-dirty $ echo dirty > a $ hg rebase -s 2 -d 7 rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" merging e transaction abort! rollback completed hit merge conflicts; re-running rebase without in-memory merge abort: uncommitted changes [255] $ cat a dirty Retrying without in-memory merge won't lose merge state $ cd .. $ hg clone repo3 repo3-merge-state -q $ cd repo3-merge-state $ hg merge 4 merging e warning: conflicts while merging e! (edit, then use 'hg resolve --mark') 2 files updated, 0 files merged, 0 files removed, 1 files unresolved use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon [1] $ hg resolve -l U e $ hg rebase -s 2 -d 7 abort: outstanding uncommitted merge (use 'hg commit' or 'hg merge --abort') [255] $ hg resolve -l U e ========================== Test for --confirm option| ========================== $ cd .. $ hg clone repo3 repo4 -q $ cd repo4 $ hg strip 7 -q $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Check it gives error when both --dryrun and --confirm is used: $ hg rebase -s 2 -d . --confirm --dry-run abort: cannot specify both --confirm and --dry-run [255] $ hg rebase -s 2 -d . --confirm --abort abort: cannot specify both --abort and --confirm [255] $ hg rebase -s 2 -d . --confirm --continue abort: cannot specify both --continue and --confirm [255] Test --confirm option when there are no conflicts: $ hg rebase -s 2 -d . --keep --config ui.interactive=True --confirm << EOF > n > EOF starting in-memory rebase rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" rebase completed successfully apply changes (yn)? n $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a $ hg rebase -s 2 -d . --keep --config ui.interactive=True --confirm << EOF > y > EOF starting in-memory rebase rebasing 2:177f92b77385 "c" rebasing 3:055a42cdd887 "d" rebasing 4:e860deea161a "e" rebase completed successfully apply changes (yn)? y $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" o 9:9fd28f55f6dc test | e | o 8:12cbf031f469 test | d | o 7:c83b1da5b1ae test | c | @ 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Test --confirm option when there is a conflict $ hg up tip -q $ echo ee>e $ hg ci --amend -m "conflict with e" -q $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 9:906d72f66a59 test | conflict with e | o 8:12cbf031f469 test | d | o 7:c83b1da5b1ae test | c | o 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a $ hg rebase -s 4 -d . --keep --confirm starting in-memory rebase rebasing 4:e860deea161a "e" merging e hit a merge conflict [1] $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n" @ 9:906d72f66a59 test | conflict with e | o 8:12cbf031f469 test | d | o 7:c83b1da5b1ae test | c | o 6:baf10c5166d4 test | g | o 5:6343ca3eff20 test | f | | o 4:e860deea161a test | | e | | | o 3:055a42cdd887 test | | d | | | o 2:177f92b77385 test |/ c | o 1:d2ae7f538514 test | b | o 0:cb9a9f314b8b test a Test a metadata-only in-memory merge $ cd $TESTTMP $ hg init no_exception $ cd no_exception # Produce the following graph: # o 'add +x to foo.txt' # | o r1 (adds bar.txt, just for something to rebase to) # |/ # o r0 (adds foo.txt, no +x) $ echo hi > foo.txt $ hg ci -qAm r0 $ echo hi > bar.txt $ hg ci -qAm r1 $ hg co -qr ".^" $ chmod +x foo.txt $ hg ci -qAm 'add +x to foo.txt' issue5960: this was raising an AttributeError exception $ hg rebase -r . -d 1 rebasing 2:539b93e77479 "add +x to foo.txt" (tip) saved backup bundle to $TESTTMP/no_exception/.hg/strip-backup/*.hg (glob) $ hg diff -c tip diff --git a/foo.txt b/foo.txt old mode 100644 new mode 100755 Test rebasing a commit with copy information, but no content changes $ cd .. $ hg clone -q repo1 merge-and-rename $ cd merge-and-rename $ cat << EOF >> .hg/hgrc > [experimental] > evolution.createmarkers=True > evolution.allowunstable=True > EOF $ hg co -q 1 $ hg mv d e $ hg ci -qm 'rename d to e' $ hg co -q 3 $ hg merge -q 4 $ hg ci -m 'merge' $ hg co -q 2 $ mv d e $ hg addremove -qs 0 $ hg ci -qm 'untracked rename of d to e' $ hg debugobsolete -q `hg log -T '{node}' -r 4` `hg log -T '{node}' -r .` 1 new orphan changesets $ hg tglog @ 6: 676538af172d 'untracked rename of d to e' | | * 5: 574d92ad16fc 'merge' | |\ | | x 4: 2c8b5dad7956 'rename d to e' | | | | o | 3: ca58782ad1e4 'b' |/ / o / 2: 814f6bd05178 'c' |/ o 1: 02952614a83d 'd' | o 0: b173517d0057 'a' $ hg rebase -b 5 -d tip rebasing 3:ca58782ad1e4 "b" rebasing 5:574d92ad16fc "merge" note: not rebasing 5:574d92ad16fc "merge", its destination already has all its changes $ cd .. Test rebasing a commit with copy information $ hg init rebase-rename $ cd rebase-rename $ echo a > a $ hg ci -Aqm 'add a' $ echo a2 > a $ hg ci -m 'modify a' $ hg co -q 0 $ hg mv a b $ hg ci -qm 'rename a to b' $ hg rebase -d 1 rebasing 2:b977edf6f839 "rename a to b" (tip) merging a and b to b saved backup bundle to $TESTTMP/rebase-rename/.hg/strip-backup/b977edf6f839-0864f570-rebase.hg $ hg st --copies --change . A b a R a $ cd .. Test rebasing a commit with copy information, where the target is empty $ hg init rebase-rename-empty $ cd rebase-rename-empty $ echo a > a $ hg ci -Aqm 'add a' $ cat > a $ hg ci -m 'make a empty' $ hg co -q 0 $ hg mv a b $ hg ci -qm 'rename a to b' $ hg rebase -d 1 rebasing 2:b977edf6f839 "rename a to b" (tip) merging a and b to b saved backup bundle to $TESTTMP/rebase-rename-empty/.hg/strip-backup/b977edf6f839-0864f570-rebase.hg $ hg st --copies --change . A b a R a $ cd .. Rebase across a copy with --collapse $ hg init rebase-rename-collapse $ cd rebase-rename-collapse $ echo a > a $ hg ci -Aqm 'add a' $ hg mv a b $ hg ci -m 'rename a to b' $ hg co -q 0 $ echo a2 > a $ hg ci -qm 'modify a' $ hg rebase -r . -d 1 --collapse rebasing 2:41c4ea50d4cf "modify a" (tip) merging b and a to b saved backup bundle to $TESTTMP/rebase-rename-collapse/.hg/strip-backup/41c4ea50d4cf-b90b7994-rebase.hg $ cd .. Test rebasing when the file we are merging in destination is empty $ hg init test $ cd test $ echo a > foo $ hg ci -Aqm 'added a to foo' $ rm foo $ touch foo $ hg di diff --git a/foo b/foo --- a/foo +++ b/foo @@ -1,1 +0,0 @@ -a $ hg ci -m "make foo an empty file" $ hg up '.^' 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b > foo $ hg di diff --git a/foo b/foo --- a/foo +++ b/foo @@ -1,1 +1,1 @@ -a +b $ hg ci -m "add b to foo" created new head $ hg rebase -r . -d 1 --config ui.merge=internal:merge3 rebasing 2:fb62b706688e "add b to foo" (tip) merging foo hit merge conflicts; re-running rebase without in-memory merge rebasing 2:fb62b706688e "add b to foo" (tip) merging foo warning: conflicts while merging foo! (edit, then use 'hg resolve --mark') unresolved conflicts (see hg resolve, then hg rebase --continue) [1] $ cd $TESTTMP Test rebasing when we're in the middle of a rebase already $ hg init test_issue6214 $ cd test_issue6214 $ echo r0 > r0 $ hg ci -qAm 'r0' $ echo hi > foo $ hg ci -qAm 'hi from foo' $ hg co -q '.^' $ echo bye > foo $ hg ci -qAm 'bye from foo' $ hg co -q '.^' $ echo unrelated > some_other_file $ hg ci -qAm 'some unrelated changes' $ hg log -G -T'{rev}: {desc}\n{files%"{file}\n"}' @ 3: some unrelated changes | some_other_file | o 2: bye from foo |/ foo | o 1: hi from foo |/ foo o 0: r0 r0 $ hg rebase -r 2 -d 1 -t:merge3 rebasing 2:b4d249fbf8dd "bye from foo" merging foo hit merge conflicts; re-running rebase without in-memory merge rebasing 2:b4d249fbf8dd "bye from foo" merging foo warning: conflicts while merging foo! (edit, then use 'hg resolve --mark') unresolved conflicts (see hg resolve, then hg rebase --continue) [1] $ hg rebase -r 3 -d 1 -t:merge3 abort: rebase in progress (use 'hg rebase --continue' or 'hg rebase --abort') [255] $ hg resolve --list U foo $ hg resolve --all --re-merge -t:other (no more unresolved files) continue: hg rebase --continue $ hg rebase --continue rebasing 2:b4d249fbf8dd "bye from foo" saved backup bundle to $TESTTMP/test_issue6214/.hg/strip-backup/b4d249fbf8dd-299ec25c-rebase.hg $ hg log -G -T'{rev}: {desc}\n{files%"{file}\n"}' o 3: bye from foo | foo | @ 2: some unrelated changes | | some_other_file o | 1: hi from foo |/ foo o 0: r0 r0