(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(DQ <'git-grep performance in various modes'>)}
          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>})
  ]
)