small improvement to roles mechanism

Bryan O'Sullivan bos at
Sat Oct 12 21:41:43 UTC 2013

On Fri, Oct 11, 2013 at 7:17 PM, Mark Lentczner <mark.lentczner at>wrote:

> Do I read Bryan's post correctly, that 20% of packages on hackage fail to
> compile with GHC 7.8?

There are currently 5615 packages on Hackage.

Of those, 3443 built successfully with 7.6.3 on my test machine yesterday,
so let's call that the baseline.

And of the 3443 that compile with 7.6.3, 1262 (37%) *fail* to compile with

You can find the complete list of regressing packages here:
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