tests/test-1102.t

debugrevspec: pass lookup function to visualize fallback mechanism

The next patch will move the exceptional parsing of old-style ranges
to revset.tokenize(). This patch will allow us to see the result tree.

Note that the parsing result of '-a-b-c-' is incorrect at this changeset.
It will be fixed soon.

  $ rm -rf a
  $ hg init a
  $ cd a
  $ echo a > a
  $ hg ci -Am0
  adding a
  $ hg tag t1 # 1
  $ hg tag --remove t1 # 2

  $ hg co 1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg tag -f -r0 t1
  $ hg tags
  tip                                3:a49829c4fc11
  t1                                 0:f7b1eb17ad24

  $ cd ..