how to checkout proper submodules

[Kazu Yamamoto ( 山本和彦 )]

Hi,

We misunderstood that the new IO manager was not working
properly. This is our fault. We confirmed that it is working
well. Sorry for bothering you, guys.

Anyway, I believe we need a way to check out proper submodules as many
others said.

--Kazu

> Hi,
> 
> Andreas and I found that the new IO manager is not working properly in
> the current GHC head. I'm sure that it worked well at least on May 7.
> 
> We need to narrow the range of commits, so I did:
> 
>   % git checkout bb2795db36b36966697c228315ae20767c4a8753
>   % git submodule update
> 
> But this does not checkout proper submodules. For instance,
> libraries/base has newer commits. And of cource, building fails.
> 
> Please tell us how to checkout proper submodules against a specific
> GHC tree.
> 
> --Kazu