[Haskell-cafe] Is it possible to get the information of instances of a type?

[Dmitry Olshansky]

For TH look also at
http://www.mail-archive.com/haskell-cafe@haskell.org/msg13057.html


2011/10/27 Magicloud Magiclouds <magicloud.magiclouds at gmail.com>

> On Thu, Oct 27, 2011 at 1:57 AM, Brent Yorgey <byorgey at seas.upenn.edu>
> wrote:
> > On Wed, Oct 26, 2011 at 09:10:23PM +0400, MigMit wrote:
> >> Can't be done. Even if this particular module doesn't contain
> >> "instance Class Type", it's quite possible that the said instance
> >> would be defined in another module, about which this one knows
> >> nothing about.
> >
> > That doesn't mean it can't be done, only that you would have to be
> > explicit about which modules to look in.
> >
> > -Brent
> >
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> >
>
> May I know more about this? Have not used TH on this subject.
>
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>
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