You can't. If you have special semantics for [String], then it is not
really a [String], it is something else. So let the type system know
that:
newtype SomethingElse = SomethingElse [String]
instance Binary SomethingElse where
...
On Wed, Jan 5, 2011 at 1:24 AM, Magicloud Magiclouds
<[email protected]> wrote:
> Hi,
> I am using Data.Binary which defined "instance Binary a => Binary
> [a]". Now I need to define "instance Binary [String]" to make
> something special for string list.
> How to make it work? I looked into the chapter of
> overlappinginstances, nothing works.
> --
> 竹密岂妨流水过
> 山高哪阻野云飞
>
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