(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:TMPDIR)
          op: assign_op.Equal
          rhs: 
            {
              (command_sub
                left_token: (Token id:Id.Left_Backtick val:'`' span_id:12)
                command_list: (command.CommandList children:[(C {(pwd)})])
              )
            }
          spids: [11]
        )
      ]
    )
    (C {(export)} {(TMPDIR)})
    (C {(exec)} {(DQ (${ Id.VSub_Name srcdir) (/test-file-has-acl.sh))})
  ]
)