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T14846.hs:38:8: error:
• Couldn't match type ‘ríki1’ with ‘Hom ríki’
‘ríki1’ is a rigid type variable bound by
the type signature for:
i :: forall k5 (cls1 :: k5
-> Constraint) k6 (xx :: k6) (a :: Struct cls1) (ríki1 :: Struct
cls1
-> Struct
cls1
-> *).
StructI xx a =>
ríki1 a a
at T14846.hs:38:8-48
Expected type: ríki1 a a
Actual type: Hom ríki a0 a0
• When checking that instance signature for ‘i’
is more general than its signature in the class
Instance sig: forall (xx :: k0) (a :: Struct cls0).
StructI xx a =>
Hom ríki a a
Class sig: forall k1 (cls :: k1
-> Constraint) k2 (xx :: k2) (a :: Struct
cls) (ríki :: Struct
cls
-> Struct
cls
-> *).
StructI xx a =>
ríki a a
In the instance declaration for ‘Category (Hom ríki)’
T14846.hs:39:12: error:
• Could not deduce (StructI xx1 (Structured a cls))
arising from a use of ‘struct’
from the context: Category ríki
bound by the instance declaration at T14846.hs:37:10-65
or from: StructI xx a
bound by the type signature for:
i :: forall (xx :: k0) (a :: Struct cls0).
StructI xx a =>
Hom ríki a a
at T14846.hs:38:8-48
The type variable ‘xx1’ is ambiguous
Relevant bindings include
i :: Hom ríki a a (bound at T14846.hs:39:3)
These potential instance exist:
instance forall k (xx :: k) (cls :: k
-> Constraint) (structured :: Struct cls).
(Structured xx cls ~ structured, cls xx) =>
StructI xx structured
-- Defined at T14846.hs:28:10
• In the expression: struct :: AStruct (Structured a cls)
In the expression: case struct :: AStruct (Structured a cls) of
In an equation for ‘i’:
i = case struct :: AStruct (Structured a cls) of
T14846.hs:39:44: error:
• Expected kind ‘Struct cls0 -> Constraint’,
but ‘cls’ has kind ‘k4 -> Constraint’
• In the second argument of ‘Structured’, namely ‘cls’
In the first argument of ‘AStruct’, namely ‘(Structured a cls)’
In an expression type signature: AStruct (Structured a cls)
• Relevant bindings include
i :: Hom ríki a a (bound at T14846.hs:39:3)
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