On Thu, May 5, 2016 at 5:52 AM, Ben Gamari <b...@well-typed.com> wrote:
>
> So, if you would like to see your program's compilation time improve
> in GHC 8.2, put some time into reducing it to something minimal, submit
> it to us via a Trac ticket, and let us know in this thread.


Please see https://ghc.haskell.org/trac/ghc/ticket/12028 for an
example with no dependencies beyond commons (ex. bytestring).  There
is a 6x performance regression or 4x if you're willing to delete
UNPACK pragmas.
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