% init repo1

% add a; ci
adding a

% cat .hg/store/fncache
data/a.i

% add a.i/b; ci
adding a.i/b

% cat .hg/store/fncache
data/a.i
data/a.i.hg/b.i

% add a.i.hg/c; ci
adding a.i.hg/c

% cat .hg/store/fncache
data/a.i
data/a.i.hg/b.i
data/a.i.hg.hg/c.i

% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
3 files, 3 changesets, 3 total revisions

% rm .hg/store/fncache

% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
 data/a.i@0: missing revlog!
 data/a.i.hg/c.i@2: missing revlog!
 data/a.i/b.i@1: missing revlog!
3 files, 3 changesets, 3 total revisions
3 integrity errors encountered!
(first damaged changeset appears to be 0)