(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'Tests rebase -i performance'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./perf-lib.sh'>})
    (C {<test_perf_default_repo>})
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:branch_merge)
          op: assign_op.Equal
          rhs: 
            {<ba5312da19c6fdb6c6747d479f58932aae6e900c> <Id.Lit_Other '^'> <Id.Lit_LBrace '{'> <commit> 
              <Id.Lit_RBrace '}'>
            }
          spids: [23]
        )
      ]
    )
    (C {<export>} {<branch_merge>})
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (command.Simple
          words: [{<git>} {<rev-parse>} {<--verify>} {($ Id.VSub_DollarName '$branch_merge')}]
          redirects: [
            (redir op:<Id.Redir_Great '>'> loc:(redir_loc.Fd fd:1) arg:{<'/dev/null'>})
            (redir op:<Id.Redir_GreatAnd '2>&'> loc:(redir_loc.Fd fd:2) arg:{<1>})
          ]
          do_fork: T
        )
        (BraceGroup
          children: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:skip_all)
                  op: assign_op.Equal
                  rhs: {(SQ <'skipping because $branch_merge was not found'>)}
                  spids: [54]
                )
              ]
            )
            (C {<test_done>})
          ]
        )
      ]
    )
    (command.Simple
      words: [{<write_script>} {<swap-first-two.sh>}]
      redirects: [
        (redir
          op: <Id.Redir_DLess '<<'>
          loc: (redir_loc.Fd fd:0)
          arg: 
            (redir_param.HereDoc
              here_begin: {(word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\E'>) <OF>}
              here_end_span_id: 79
              stdin_parts: [
                <'case "$1" in\n'>
                <'*/COMMIT_EDITMSG)\n'>
                <'\tmv "$1" "$1".bak &&\n'>
                <'\tsed -e \'1{h;d}\' -e 2G <"$1".bak >"$1"\n'>
                <'\t;;\n'>
                <'esac\n'>
              ]
            )
        )
      ]
      do_fork: T
    )
    (C {<test_expect_success>} {(SQ <setup>)} 
      {
        (SQ <'\n'> <'\tgit config core.editor "\\"$PWD"/swap-first-two.sh\\" &&\n'> 
          <'\tgit checkout -f $branch_merge^2\n'>
        )
      }
    )
    (C {<test_perf>} {(SQ <'rebase -i'>)} {(SQ <'\n'> <'\tgit rebase -i $branch_merge^\n'>)})
    (C {<test_done>})
  ]
)