removing repo that was cloned breaks clone

[Christian Ebert]

Hi,

Can somebody else confirm the following:

$ hg init test
$ cd test
$ echo hello >a
$ hg add a
$ hg ci -m hello
$ echo world >>a
$ hg ci -m world
$ cd ..
$ hg clone test test-1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -rP test
$ cd test-1/
$ hg tip
abort: requirement '���������������' not supported!

If yes, I think this is a quite serious bug, probably to do with
hardlinks.

c
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