(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:test_description)
          op: Equal
          rhs: {(DQ ('git-grep performance in various modes'))}
          spids: [4]
        )
      ]
      spids: [4]
    )
    (C {(.)} {(./perf-lib.sh)})
    (C {(test_perf_large_repo)})
    (C {(test_checkout_worktree)})
    (C {(test_perf)} {(SQ <'grep worktree, cheap regex'>)} 
      {(SQ <'\n'> <'\tgit grep some_nonexistent_string || :\n'>)}
    )
    (C {(test_perf)} {(SQ <'grep worktree, expensive regex'>)} 
      {(SQ <'\n'> <'\tgit grep "^.* *some_nonexistent_string$" || :\n'>)}
    )
    (C {(test_perf)} {(SQ <'grep --cached, cheap regex'>)} 
      {(SQ <'\n'> <'\tgit grep --cached some_nonexistent_string || :\n'>)}
    )
    (C {(test_perf)} {(SQ <'grep --cached, expensive regex'>)} 
      {(SQ <'\n'> <'\tgit grep --cached "^.* *some_nonexistent_string$" || :\n'>)}
    )
    (C {(test_done)})
  ]
)