Data/UTC/Class/HasUnixTime.hs:39:3: error:
• Constraint ‘Monad m’ in the type of ‘getUnixTime’
constrains only the class type variables
Use ConstrainedClassMethods to allow it
• When checking the class method:
getUnixTime :: forall (m :: * -> *).
HasUnixTime m =>
forall a. (Monad m, IsUnixTime a) => m a
In the class declaration for ‘HasUnixTime’
cabal: Leaving directory '/tmp/cabal-tmp-9305/utc-0.2.0.1'
cabal: Error: some packages failed to install:
utc-0.2.0.1 failed during the building phase. The exception was:
ExitFailure 1
Data/UTC/Class/HasUnixTime.hs:39:3: error:
• Constraint ‘Monad m’ in the type of ‘getUnixTime’
constrains only the class type variables
Use ConstrainedClassMethods to allow it
• When checking the class method:
getUnixTime :: forall (m :: * -> *).
HasUnixTime m =>
forall a. (Monad m, IsUnixTime a) => m a
In the class declaration for ‘HasUnixTime’
cabal: Leaving directory '/tmp/cabal-tmp-9305/utc-0.2.0.1'
cabal: Error: some packages failed to install:
utc-0.2.0.1 failed during the building phase. The exception was:
ExitFailure 1