I noticed earlier that running $ git checkout -b test master... would result in the following failure message: fatal: Not a valid object name: 'master...'. I believe that this is a bug, so this patchset will allow this to succeed. Denton Liu (3): t2018: cleanup in current test t2018: demonstrate checkout -b merge base bug checkout: allow -b/-B to work on a merge base builtin/checkout.c | 4 ++- t/t2018-checkout-branch.sh | 52 +++++++++++++++++++------------------- 2 files changed, 29 insertions(+), 27 deletions(-) -- 2.21.0.1033.g0e8cc1100c