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T15685.hs:13:24: error:
• Could not deduce: a ~ [k0]
from the context: as ~ (a1 : as1)
bound by a pattern with constructor:
Here :: forall {a1} (f :: a1 -> *) (a2 :: a1) (as :: [a1]).
f a2 -> NS f (a2 : as),
in a pattern synonym declaration
at T15685.hs:13:19-26
‘a’ is a rigid type variable bound by
the inferred type of HereNil :: NS f as
at T15685.hs:13:9-15
Possible fix: add a type signature for ‘HereNil’
• In the pattern: Nil
In the pattern: Here Nil
In the declaration for pattern synonym ‘HereNil’
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