T11974b.hs:5:1: error:
    • The default type ‘Either’ is not an instance of
        ‘Num’ or ‘Show’ or ‘Eq’ or ‘Ord’ or ‘Foldable’ or ‘Traversable’
    • When checking the types in a default declaration

T11974b.hs:5:1: error:
    • The default type ‘Monad’ is not an instance of
        ‘Num’ or ‘Show’ or ‘Eq’ or ‘Ord’ or ‘Foldable’ or ‘Traversable’
    • When checking the types in a default declaration

T11974b.hs:5:1: error:
    • The default type ‘Blah’ is not an instance of
        ‘Num’ or ‘Show’ or ‘Eq’ or ‘Ord’ or ‘Foldable’ or ‘Traversable’
    • When checking the types in a default declaration