# Fetch enough history to find a common ancestor commit (aka merge-base):
  git fetch origin +4a5f4e5[3](https://github.com/python/cpython/actions/runs/7332379271/job/19966447077?pr=113501#step:3:3)31da7b9f0d52237da7772736a260e327:remotes/origin/gh-#67512-mention-that-flags-arg-to-imaplib's-append-should-be-a-string --depth=$(( 1 + 1 )) \
    --no-tags --prune --no-recurse-submodules
  
  # This should get the oldest commit in the local fetched history (which may not be the commit the PR branched from):
  COMMON_ANCESTOR=$( git rev-list --first-parent --max-parents=0 --max-count=1 origin/gh-#67512-mention-that-flags-arg-to-imaplib's-append-should-be-a-string )
  DATE=$( git log --date=iso8601 --format=%cd "${COMMON_ANCESTOR}" )
  
  # Get all commits since that commit date from the base branch (eg: master or main):
  git fetch origin +[4](https://github.com/python/cpython/actions/runs/7332379271/job/19966447077?pr=113501#step:3:4)e67644d367673bbacc40a0d8efb777410437b93:remotes/origin/main --shallow-since="${DATE}" \
    --no-tags --prune --no-recurse-submodules
  shell: /usr/bin/bash -e {0}
  env:
    branch_base: origin/main
    branch_pr: origin/gh-#67[5](https://github.com/python/cpython/actions/runs/7332379271/job/19966447077?pr=113501#step:3:5)12-mention-that-flags-arg-to-imaplib's-append-should-be-a-string
    refspec_base: +4e[6](https://github.com/python/cpython/actions/runs/7332379271/job/19966447077?pr=113501#step:3:6)7644d367673bbacc40a0d8efb777410437b93:remotes/origin/main
    refspec_pr: +4a5f4e5331da7b9f0d52237da7772736a260e327:remotes/origin/gh-#67512-mention-that-flags-arg-to-imaplib's-append-should-be-a-string
/home/runner/work/_temp/754e2a0b-c0b8-43bd-8c10-70085ea407c3.sh: line 6: syntax error near unexpected token `)'

git checkout -b imaplib-append