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