Document some bugs in "git fetch-pack":

1. If "git fetch-pack" is called with "--all", "--depth", and an
explicit existing non-tag reference to fetch, then it falsely reports
that the reference was not found, even though it was fetched
correctly.

2. If "git fetch-pack" is called with "--all", "--depth", and an
explicit existing tag reference to fetch, then it segfaults in
filter_refs() because return_refs is used without having been
initialized.

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 t/t5500-fetch-pack.sh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/t/t5500-fetch-pack.sh b/t/t5500-fetch-pack.sh
index 6fa1cef..15d277f 100755
--- a/t/t5500-fetch-pack.sh
+++ b/t/t5500-fetch-pack.sh
@@ -427,4 +427,19 @@ test_expect_success 'test missing ref before existing' '
        test_cmp expect-error error-me
 '
 
+test_expect_failure 'test --all, --depth, and explicit head' '
+       (
+               cd client &&
+               git fetch-pack --no-progress --all --depth=1 .. refs/heads/A
+       ) >out-adh 2>error-adh
+'
+
+test_expect_failure 'test --all, --depth, and explicit tag' '
+       git tag OLDTAG refs/heads/B~5 &&
+       (
+               cd client &&
+               git fetch-pack --no-progress --all --depth=1 .. refs/tags/OLDTAG
+       ) >out-adt 2>error-adt
+'
+
 test_done
-- 
1.7.11.3

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