(List
  (FunctionDef print_message_and_exit []
    (List
      (Com {[LIT_CHARS echo]} {[VarSub 1]}
        <
        (DescriptorRedirectNode target={[LIT_CHARS 2]} <REDIR_GREATAND ">&"> 1),
        >
      )
      (Com {[LIT_CHARS exit]} {[LIT_CHARS 1]})
    )
  )
  (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('CURRENT_SCRIPT', {[VarSub BASH_SOURCE bracket_op=(Index {A Atom NODE_ARITH_WORD {[AS_NUM_LITERAL 0]}})]})])
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS cd]} {[DQ [ComSub (Com {[LIT_CHARS dirname]} {[VarSub CURRENT_SCRIPT]})]]})
    (Com {[LIT_CHARS print_message_and_exit]} {[DQ [LIT_CHARS "Unable to access "]] [ComSub (Com {[LIT_CHARS dirname]} {[VarSub CURRENT_SCRIPT]})] [DQ ]})
  )
  (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('DIR', {[ComSub (Com {[LIT_CHARS pwd]})]})])
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS source]} {[DQ [VarSub DIR][LIT_CHARS /unittest.bash]]})
    (Com {[LIT_CHARS print_message_and_exit]} {[DQ [LIT_CHARS "unittest.bash not found!"]]})
  )
  (AndOr OP_OR_IF
    (Com {[LIT_CHARS source]} {[DQ [VarSub DIR][LIT_CHARS /testenv.sh]]})
    (Com {[LIT_CHARS print_message_and_exit]} {[DQ [LIT_CHARS "testenv.sh not found!"]]})
  )
)