Issue with package "pretty"

Bulat Ziganshin bulat.ziganshin at
Sun Apr 27 15:49:01 EDT 2008

Hello Duncan,

Sunday, April 27, 2008, 11:42:01 PM, you wrote:

>> > The problem is that if you install pretty, Cabal will suddenly cease
>> > working until you recompile it. It depends on a version of pretty
>> > which gets bundled with GHC is purportedly of the same version as the
>> > one on hackage, but the two aren't binary compatible. So when it tries
>> > to use it, everything goes boom.

> The solution is not to identify installed packages by their name and
> version but by a hash that identifies the package ABI.

probably not ABI (it should be the same), but random number generated
when compilation (build) occurs

Best regards,
 Bulat                            mailto:Bulat.Ziganshin at

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