Instrumenting overlapping instances

[J. Garrett Morris]

Hello,

I'm currently studying the use of overlapping instances, and I was
hoping to instrument GHC to produce some variety of list of instances
that overlapped.  I haven't done any GHC hacking so far, so I'm not
entirely familiar with the code base.  Does anyone have any guidance
on which modules I should likely need to modify?

Thanks,

 /g