Confusing warnings from GHC HEAD

Johan Tibell johan.tibell at
Tue Aug 31 05:15:49 EDT 2010

On Tue, Aug 31, 2010 at 11:06 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.

Is this the right fix in general? I try to keep my code warning free but I
don't want to bump the count unless it's always a win. If it's not always a
win perhaps it should be a warning that's on by default?

-- Johan
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