(CommandList
  children: [
    (C {(set)} {(-e)})
    (C {(cd)} 
      {
        (DQ 
          (CommandSubPart
            command_list: 
              (CommandList
                children: [(C {(dirname)} {(DQ ($ VSub_Name "$BASH_SOURCE") ("[0]"))})]
              )
            left_token: <Left_CommandSub "$(">
            spids: [11 18]
          ) (/..)
        )
      }
    )
    (C {(dart)} {(-c)} {(tool/patch_sdk.dart)} {(tool/input_sdk)} {(gen/patched_sdk)})
  ]
)