blob: bf9a59cb8afe1efda6c4a0b5c7edc30b627a702e (
plain)
1
2
3
4
5
6
|
T3833.hs:9:1: error:
Can't make a derived instance of ‘Monoid (DecodeMap e)’:
‘Monoid’ is not a stock derivable class (Eq, Show, etc.)
Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
In the stand-alone deriving instance for ‘Monoid (DecodeMap e)’
|
