Shake fails test with GHC 7.10 RC3
iavor.diatchki at gmail.com
Sat Mar 21 18:31:33 UTC 2015
This is very odd---the example on the ticket does not use `Typeable` at all.
I looked through the diffs of the patch and I can't see anything obviously
Also, the `Typeable` code only touches modules that are in the front-end,
and when I compile without optimizations, the example looks reasonable.
I wonder if the problem is related to some odd interaction between
simplification rules and representational equities?
On Sat, Mar 21, 2015 at 4:35 AM, Herbert Valerio Riedel <hvriedel at gmail.com>
> On 2015-03-21 at 08:21:20 +0100, Herbert Valerio Riedel wrote:
> > On 2015-03-21 at 07:56:32 +0100, Neil Mitchell wrote:
> > [...]
> >> 3) I tested with GHC RC1 and GHC RC2, both of which were fine. The fact
> >> one else hit this with RC2 might just be because its a very recent
> >> regression.
> > We -- and by that I don't mean myself... :) -- could git-bisect between
> > RC2 and RC3 here (semi-)automatically (i.e. maybe unattended if it's
> > scriptable) if your test-case (even if it's not minimal) reliably
> > triggers the bug...
> I scripted up a test and git-bisected between RC2 and RC3, and the
> following commit is the one where `shake-test oracle test` starts
> ...which sadly is a rather large patch :-/
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