+git checkout -b stoats $tagpfx/$vanished
+t-commit 'Simulate accidentally building on rejected version'
+t-dgit build
+t-expect-push-fail "HEAD is not a descendant of the archive's version" \
+t-dgit push
+
+: "check that uploader can't force it now"
+t-expect-push-fail "not fast forward on dgit branch" \
+t-dgit --deliberately-not-fast-forward push
+
+t-dgit pull
+t-dgit build
+t-expect-push-fail \
+ 'Reason: rewound suite sid; --deliberately-not-fast-forward specified' \
+t-dgit push
+
+t-ok