(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:test_description)
          op: Equal
          rhs: {(SQ <'Tests log -L performance'>)}
          spids: [4]
        )
      ]
      spids: [4]
    )
    (C {(.)} {(./perf-lib.sh)})
    (C {(test_perf_default_repo)})
    (C {(test_expect_success)} {(SQ <'select a file'>)} 
      {
        (SQ <'\n'> <'\tgit ls-tree HEAD | grep ^100644 |\n'> 
          <'\tsort -k 3 | head -1 | cut -f 2 >filelist\n'>
        )
      }
    )
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:file)
          op: Equal
          rhs: 
            {
              (CommandSubPart
                command_list: (CommandList children:[(C {(cat)} {(filelist)})])
                left_token: <Left_CommandSub '$('>
                spids: [37 41]
              )
            }
          spids: [36]
        )
      ]
      spids: [36]
    )
    (C {(export)} {(file)})
    (C {(test_perf)} {(SQ <'git rev-list --topo-order (baseline)'>)} 
      {(SQ <'\n'> <'\tgit rev-list --topo-order HEAD >/dev/null\n'>)}
    )
    (C {(test_perf)} {(SQ <'git log --follow (baseline for -M)'>)} 
      {(SQ <'\n'> <'\tgit log --oneline --follow -- "$file" >/dev/null\n'>)}
    )
    (C {(test_perf)} {(SQ <'git log -L (renames off)'>)} 
      {(SQ <'\n'> <'\tgit log --no-renames -L 1:"$file" >/dev/null\n'>)}
    )
    (C {(test_perf)} {(SQ <'git log -L (renames on)'>)} 
      {(SQ <'\n'> <'\tgit log -M -L 1:"$file" >/dev/null\n'>)}
    )
    (C {(test_done)})
  ]
)