[Bug 4765] New: hg log fails on hidden revision '0' after pruning the first changeset

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4765

          Priority: normal
            Bug ID: 4765
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: hg log fails on hidden revision '0' after pruning the
                    first changeset
          Severity: bug
    Classification: Unclassified
                OS: Mac OS
          Reporter: lcharignon at fb.com
          Hardware: Macintosh
            Status: UNCONFIRMED
           Version: stable branch
         Component: Mercurial
           Product: Mercurial

Steps to repro:

$ # Enable markers creation
$ cd /tmp
$ hg init repo
$ cd repo
$ echo "aa" > a; hg add a; hg commit -m "a"
$ hg prune .
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  working directory now at 000000000000
  1 changesets pruned
$ echo "bb" > b; hg add b; hg commit -m "b"
$ hg log
  abort: hidden revision '0'!
  (use --hidden to access hidden revisions)

The issue is that hg log aborts and it should not, it should show the commit
'b'.

When digging down, the interesting point to dig is the constructor of
changectx. While evaluating the expression, the constructor of changectx is
called with a changeid of 0 and returns a hidden node as opposed to 0.

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