On Oct 11, 2012, at 6:23 PM, Mikhail Glushenkov <the.dead.shall.r...@gmail.com> 
wrote:

> Hello,
> 
> On Thu, Oct 11, 2012 at 3:54 PM, MigMit <miguelim...@yandex.ru> wrote:
>> You have a bigger problem coming. Some extensions make multiple instances 
>> OK, even in Safe Haskell. For example:
>> 
>> {-# LANGUAGE FlexibleInstances, IncoherentInstances, Safe #-}
>> [...]
> 
> Safe Haskell already disallows OverlappingInstances.

It doesn't. Overlapping instances are allowed in safe modules, provided that 
they won't be used in other modules.
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