(CommandList
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    (C {(set)} {(-e)})
    (C {(cd)} 
      {
        (CommandSubPart
          command_list: 
            (CommandList
              children: [
                (C {(dirname)} 
                  {
                    (DQ 
                      (BracedVarSub
                        token: <VSub_Name BASH_SOURCE>
                        bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                        spids: [14 19]
                      )
                    )
                  }
                )
              ]
            )
          left_token: <Left_CommandSub "$(">
          spids: [9 22]
        ) (/..)
      }
    )
    (C {(.)} {(./tool/dependency_overrides.sh)})
    (C {(checkout_dependency_override_from_github)} {(analyzer)} {(dart-lang/sdk)} {($ VSub_Number "$1")} 
      {(/pkg/analyzer/)}
    )
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)