/private/var/folders/gt/tp3vtxxs77b960txrxxndfqm0000gn/T/stack26835/glpk-hs-0.5/Data/LinearProgram/Types.hs:16:10: error:
• No instance for (Semigroup VarKind)
arising from the superclasses of an instance declaration
• In the instance declaration for ‘Monoid VarKind’
|
16 | instance Monoid VarKind where
| ^^^^^^^^^^^^^^
/private/var/folders/gt/tp3vtxxs77b960txrxxndfqm0000gn/T/stack26835/glpk-hs-0.5/Data/LinearProgram/Types.hs:39:10: error:
• Could not deduce (Semigroup (Bounds a))
arising from the superclasses of an instance declaration
from the context: Ord a
bound by the instance declaration
at Data/LinearProgram/Types.hs:39:10-35
• In the instance declaration for ‘Monoid (Bounds a)’
|
39 | instance Ord a => Monoid (Bounds a) where
|
I think some
Semigroup
instances are required