Confusing warnings from GHC HEAD

Bryan O'Sullivan bos at
Wed Sep 1 00:11:13 EDT 2010

On Tue, Aug 31, 2010 at 2:06 AM, Simon Peyton-Jones
<simonpj at>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?
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