Re: Confusing warnings from GHC HEAD

On Tue, Aug 31, 2010 at 09:11:13PM -0700, Bryan O'Sullivan wrote:

On Tue, Aug 31, 2010 at 2:06 AM, Simon Peyton-Jones wrote:

...

I can’t reproduce this. With the enclosed module and HEAD, I get the warning; but when I add –fspec-constr-count=5, the warning goes away and I get the specialised rules.

Could Cabal not be passing on the flag or something?

I see -fspec-constr-count=5 in the command line being passed to ghc when I run "cabal build -v", so I don't think that's to blame?

I've filed a ticket for this, with a standalone testcase, here: http://hackage.haskell.org/trac/ghc/ticket/4288 Thanks Ian