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T14584.hs:57:41: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)]
• Could not deduce ‘SingI a’ arising from a use of ‘sing’
from the context: (Action act, Monoid a, Good m)
bound by the instance declaration at T14584.hs:55:10-89
• In the second argument of ‘fromSing’, namely
‘(sing @m @a :: Sing _)’
In the fourth argument of ‘act’, namely
‘(fromSing @m (sing @m @a :: Sing _))’
In the expression:
act @_ @_ @act (fromSing @m (sing @m @a :: Sing _))
T14584.hs:57:50: warning: [GHC-25897] [-Wdeferred-type-errors (in -Wdefault)]
• Could not deduce ‘m ~ *’
from the context: (Action act, Monoid a, Good m)
bound by the instance declaration at T14584.hs:55:10-89
‘m’ is a rigid type variable bound by
the instance declaration
at T14584.hs:55:10-89
• In the type ‘a’
In the second argument of ‘fromSing’, namely
‘(sing @m @a :: Sing _)’
In the fourth argument of ‘act’, namely
‘(fromSing @m (sing @m @a :: Sing _))’
T14584.hs:57:60: warning: [GHC-88464] [-Wpartial-type-signatures (in -Wdefault)]
• Found type wildcard ‘_’ standing for ‘a :: m’
Where: ‘a’, ‘m’ are rigid type variables bound by
the instance declaration
at T14584.hs:55:10-89
• In the first argument of ‘Sing’, namely ‘_’
In an expression type signature: Sing _
In the second argument of ‘fromSing’, namely
‘(sing @m @a :: Sing _)’
• Relevant bindings include
monHom :: a -> a (bound at T14584.hs:57:3)
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