t-git-debrebase --noop-ok convert-from-dgit-view
t-ref-head
-t-git-debrebase convert-from-dgit-view --always-convert-anyway
+t-git-debrebase -falready-converted convert-from-dgit-view \
+ --always-convert-anyway
t-expect-fail E:'ref varies' t-ref-head
t-gdr-good laundered