old_contents: import warnings
  
  from statsmodels.stats.diagnostic import (
      CompareCox, CompareJ, HetGoldfeldQuandt, OLS, ResultsStore, acorr_breusch_godfrey,
      acorr_ljungbox, acorr_lm, breaks_cusumolsresid, breaks_hansen, compare_cox, compare_j,
      het_arch, het_breuschpagan, het_goldfeldquandt, het_white, linear_harvey_collier, linear_lm,
      linear_rainbow, recursive_olsresiduals, spec_white, unitroot_adf
  )
  from statsmodels.tsa.stattools import adfuller
  
  __all__ = ["CompareCox", "CompareJ", "HetGoldfeldQuandt", "OLS",
             "ResultsStore", "acorr_breusch_godfrey", "acorr_ljungbox",
             "acorr_lm", "adfuller", "breaks_cusumolsresid", "breaks_hansen",
             "compare_cox", "compare_j", "het_arch", "het_breuschpagan",
             "het_goldfeldquandt", "het_white", "linear_harvey_collier",
             "linear_lm", "linear_rainbow", "recursive_olsresiduals",
             "spec_white", "unitroot_adf"]
  
  
  warnings.warn("The statsmodels.sandbox.stats.diagnostic module is deprecated. "
                "Use statsmodels.stats.diagnostic.", DeprecationWarning,
                stacklevel=2)
  
new_contents: import warnings
  
  from statsmodels.stats.diagnostic import (
      CompareCox, CompareJ, HetGoldfeldQuandt, OLS, ResultsStore, acorr_breusch_godfrey,
      acorr_ljungbox, acorr_lm, breaks_cusumolsresid, breaks_hansen, compare_cox, compare_j,
      het_arch, het_breuschpagan, het_goldfeldquandt, het_white, linear_harvey_collier, linear_lm,
      linear_rainbow, recursive_olsresiduals, spec_white
  )
  from statsmodels.tsa.stattools import adfuller
  
  __all__ = ["CompareCox", "CompareJ", "HetGoldfeldQuandt", "OLS",
             "ResultsStore", "acorr_breusch_godfrey", "acorr_ljungbox",
             "acorr_lm", "adfuller", "breaks_cusumolsresid", "breaks_hansen",
             "compare_cox", "compare_j", "het_arch", "het_breuschpagan",
             "het_goldfeldquandt", "het_white", "linear_harvey_collier",
             "linear_lm", "linear_rainbow", "recursive_olsresiduals",
             "spec_white"]
  
  
  warnings.warn("The statsmodels.sandbox.stats.diagnostic module is deprecated. "
                "Use statsmodels.stats.diagnostic.", DeprecationWarning,
                stacklevel=2)
  
subject: Remove unitroot_adf