Comments (1)
phadej
commented on September 23, 2024
with StandaloneDeriving and DeriveDataTypeable and
deriving instance Typeable a => Typeable (Matrix a)GHC refuses with an error:
Can't make a derived instance of ‘Typeable (Matrix a)’:
Deriving Typeable is not allowed for family instances;
derive Typeable for ‘Matrix’ alone
In the stand-alone deriving instance for
‘Typeable a => Typeable (Matrix a)’
However if we derive just Typeable Matrix as error message suggest, everything compiles ok:
deriving instance Typeable Matrixfrom bed-and-breakfast.
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from bed-and-breakfast.