(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:test_description)
          op: Equal
          rhs: {(SQ <"test unique sha1 abbreviation on \"index from..to\" line">)}
          spids: [4]
        )
      ]
      spids: [4]
    )
    (C {(.)} {(./test-lib.sh)})
    (SimpleCommand
      words: [{(cat)}]
      redirects: [
        (Redir op_id:Redir_Great fd:-1 arg_word:{(expect_initial)} spids:[16])
        (HereDoc
          op_id: Redir_DLess
          fd: -1
          body: {(DQ ("100644 blob 51d2738463ea4ca66f8691c91e33ce64b7d41bb1\tfoo\n"))}
          do_expansion: True
          here_end: EOF
          was_filled: True
          spids: [19]
        )
      ]
    )
    (SimpleCommand
      words: [{(cat)}]
      redirects: [
        (Redir op_id:Redir_Great fd:-1 arg_word:{(expect_update)} spids:[26])
        (HereDoc
          op_id: Redir_DLess
          fd: -1
          body: {(DQ ("100644 blob 51d2738efb4ad8a1e40bed839ab8e116f0a15e47\tfoo\n"))}
          do_expansion: True
          here_end: EOF
          was_filled: True
          spids: [29]
        )
      ]
    )
    (C {(test_expect_success)} {(SQ <setup>)} 
      {
        (SQ <"\n"> <"\techo 4827 > foo &&\n"> <"\tgit add foo &&\n"> 
          <"\tgit commit -m \"initial\" &&\n"> <"\tgit cat-file -p HEAD: > actual &&\n"> <"\ttest_cmp expect_initial actual &&\n"> 
          <"\techo 11742 > foo &&\n"> <"\tgit commit -a -m \"update\" &&\n"> <"\tgit cat-file -p HEAD: > actual &&\n"> 
          <"\ttest_cmp expect_update actual\n">
        )
      }
    )
    (SimpleCommand
      words: [{(cat)}]
      redirects: [
        (Redir op_id:Redir_Great fd:-1 arg_word:{(expect)} spids:[56])
        (HereDoc
          op_id: Redir_DLess
          fd: -1
          body: {(DQ ("index 51d27384..51d2738e 100644\n"))}
          do_expansion: True
          here_end: EOF
          was_filled: True
          spids: [59]
        )
      ]
    )
    (C {(test_expect_success)} {(SQ <"diff does not produce ambiguous index line">)} 
      {
        (SQ <"\n"> <"\tgit diff HEAD^..HEAD | grep index > actual &&\n"> <"\ttest_cmp expect actual\n">)
      }
    )
    (C {(test_done)})
  ]
)