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As f178c13f (Revert "Merge branch 'sb/submodule-core-worktree'", 2018-09-07) was produced shortly before a release, nobody asked for a regression test to be included. Add a regression test that makes sure that the invocation of `git submodule update` on old setups doesn't produce errors as pointed out in f178c13f . The place to add such a regression test may look odd in t7412, but that is the best place as there we setup old style submodule setups explicitly. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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