Running with -XNoAlternativeLayoutRule
Running with -XAlternativeLayoutRule

layout001.hs:6:3: parse error on input ‘where’
Running with -XAlternativeLayoutRule -XAlternativeLayoutRuleTransitional

layout001.hs:6:3: Warning:
    transitional layout will not be accepted in the future:
    `where' clause at the same depth as implicit layout block