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T15487.hs:7:9: error: [GHC-87543]
Ambiguous occurrence ‘null’
It could refer to
either ‘Prelude.null’,
imported from ‘Prelude’ at T15487.hs:1:8-13
(and originally defined in ‘Data.Foldable’)
or ‘T15487.null’, defined at T15487.hs:5:1
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