(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'test @{-N} syntax'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./test-lib.sh'>})
    (command.ShFunction
      name: make_commit
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DAmp Id.Op_DAmp]
              children: [
                (command.Simple
                  words: [{<echo>} {(DQ ($ Id.VSub_Number '$1'))}]
                  redirects: [
                    (redir
                      op: <Id.Redir_Great '>'>
                      loc: (redir_loc.Fd fd:1)
                      arg: {(DQ ($ Id.VSub_Number '$1'))}
                    )
                  ]
                  do_fork: T
                )
                (C {<git>} {<add>} {(DQ ($ Id.VSub_Number '$1'))})
                (C {<git>} {<commit>} {<-m>} {(DQ ($ Id.VSub_Number '$1'))})
              ]
            )
          ]
        )
    )
    (C {<test_expect_success>} {(SQ <setup>)} 
      {
        (SQ <'\n'> <'\n'> <'\tmake_commit 1 &&\n'> <'\tgit branch side &&\n'> <'\tmake_commit 2 &&\n'> 
          <'\tmake_commit 3 &&\n'> <'\tgit checkout side &&\n'> <'\tmake_commit 4 &&\n'> <'\tgit merge master &&\n'> 
          <'\tgit checkout master\n'> <'\n'>
        )
      }
    )
    (C {<test_expect_success>} {(SQ <'@{-1} works'>)} {(SQ <'\n'> <'\ttest_cmp_rev side @{-1}\n'>)})
    (C {<test_expect_success>} {(SQ <'@{-1}~2 works'>)} {(SQ <'\n'> <'\ttest_cmp_rev side~2 @{-1}~2\n'>)})
    (C {<test_expect_success>} {(SQ <'@{-1}^2 works'>)} {(SQ <'\n'> <'\ttest_cmp_rev side^2 @{-1}^2\n'>)})
    (C {<test_expect_success>} {(SQ <'@{-1}@{1} works'>)} 
      {(SQ <'\n'> <'\ttest_cmp_rev side@{1} @{-1}@{1}\n'>)}
    )
    (C {<test_expect_success>} {(SQ <'@{-2} works'>)} {(SQ <'\n'> <'\ttest_cmp_rev master @{-2}\n'>)})
    (C {<test_expect_success>} {(SQ <'@{-3} fails'>)} 
      {(SQ <'\n'> <'\ttest_must_fail git rev-parse @{-3}\n'>)}
    )
    (C {<test_done>})
  ]
)