Shake fails test with GHC 7.10 RC3

[Herbert Valerio Riedel]

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 no
>> 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
failing

  http://git.haskell.org/ghc.git/commitdiff/6f46fe15af397d448438c6b93babcdd68dd78df8

...which sadly is a rather large patch :-/