On Thu, Mar 6, 2014 at 1:06 PM, Simon Peyton Jones <simonpj@microsoft.com> wrote:

What is this file?

nofib/real/HMMS/lib/haskell/Builtin.hi

It’s a mystery!  Can we delete it?


I think it's safe to assume that it was added by mistake. David even tried to remove it once:

tmp/ghc/nofib$ git log real/HMMS/lib/haskell/Builtin.hi
commit af36a39eed2e598c1f4c49dd726d3732b53b0f46
Author: David Terei <davidterei@gmail.com>
Date:   Thu Jan 19 12:29:04 2012 -0800

    Revert "Move benchmarks into benchmark/ subdir."
    
    This reverts commit 0449cb065437fc8014b6669e5f1c2c8f4a926d16.
    
    Conflicts:
    
        .gitignore

commit 0449cb065437fc8014b6669e5f1c2c8f4a926d16
Author: David Terei <davidterei@gmail.com>
Date:   Tue Jan 17 10:53:12 2012 -0800

    Move benchmarks into benchmark/ subdir.

commit 0bd88c95b14252969c9dd0a5eaa9da219af5f85f
Author: partain <unknown>
Date:   Mon Jan 8 20:13:28 1996 +0000

    [project @ 1996-01-08 20:13:28 by partain]
    Initial revision