(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:TMPDIR)
          op: Equal
          rhs: 
            {
              (CommandSubPart
                command_list: (CommandList children:[(C {(pwd)})])
                left_token: <Left_Backtick '`'>
                spids: [12 14]
              )
            }
          spids: [11]
        )
      ]
      spids: [11]
    )
    (C {(export)} {(TMPDIR)})
    (C {(exec)} {(DQ (${ VSub_Name srcdir) (/test-file-has-acl.sh))})
  ]
)