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T7085.hs:8:6: warning: [GHC-61367] [-Wunused-pattern-binds (in -Wextra, -Wunused-binds)]
This pattern-binding binds no variables: Nothing = Just n
T7085.hs:8:6: warning: [GHC-53633] [-Woverlapping-patterns (in -Wdefault)]
Pattern match is redundant
In a pattern binding: Nothing = ...
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