(command.CommandList
  children: [
    (C {<Id.KW_Set set>} {<-e>})
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:SOURCE_DIR)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (command_sub
                  left_token: <Id.Left_DollarParen '$('>
                  command_list: 
                    (command.CommandList
                      children: [
                        (command.AndOr
                          ops: [Id.Op_DAmp]
                          children: [
                            (C {<cd>} 
                              {
                                (DQ 
                                  (command_sub
                                    left_token: <Id.Left_DollarParen '$('>
                                    command_list: 
                                      (command.CommandList
                                        children: [
                                          (C {<dirname>} 
                                            {
                                              (DQ 
                                                (braced_var_sub
                                                  token: <Id.VSub_Name BASH_SOURCE>
                                                  bracket_op: 
                                                    (bracket_op.ArrayIndex
                                                      expr: 
                                                        (arith_expr.ArithWord
                                                          w: {<Id.Lit_Digits 0>}
                                                        )
                                                    )
                                                )
                                              )
                                            }
                                          )
                                        ]
                                      )
                                  )
                                )
                              }
                            )
                            (C {<pwd>})
                          ]
                        )
                      ]
                    )
                )
              )
            }
          spids: [62]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:version)
          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$1')}
          spids: [93]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:CHANGELOG)
          op: assign_op.Equal
          rhs: {($ Id.VSub_DollarName '$SOURCE_DIR') </../../CHANGELOG.md>}
          spids: [97]
        )
      ]
    )
    (C {<python>} {($ Id.VSub_DollarName '$SOURCE_DIR') </changelog.py>} 
      {($ Id.VSub_DollarName '$version')} {<0>} {($ Id.VSub_DollarName '$CHANGELOG')}
    )
    (C {<git>} {<add>} {($ Id.VSub_DollarName '$CHANGELOG')})
    (C {<git>} {<commit>} {<-m>} 
      {(DQ <'[Release] Update CHANGELOG.md for '> ($ Id.VSub_DollarName '$version'))}
    )
  ]
)