Changes to primops break libraries (was Re: 7.8 Feature window)

Gregory Collins greg at
Mon Aug 26 13:49:58 CEST 2013

On Mon, Aug 26, 2013 at 12:51 PM, Herbert Valerio Riedel <hvr at>wrote:

> ...btw, do we actually know which (or how many) packages are affected?

I believe at least one of my packages will be affected, and even if we go
and run the analysis on Hackage (I expect only a handful of packages to run
into this API change), there's the "dark matter" not visible to us in all
of the commercial Haskell codebases to consider.  Naming is important, but
IMO not so important that you need to break working user programs to hang
onto a preferred name, at least not without a deprecation cycle of at least
one major GHC version.

Gregory Collins <greg at>
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