Some suggestion for "mutually recursive modules" problem.

[Andy Stewart]

Dear GHC developers:

First thanks for your work with GHC! 

And i have suggestion for "mutually recursive modules" problem:

Now GHC use .hs-boot fix "mutually recursive modules" problem, yes it
can work, but it not pretty.

So GHC can fix this problem automatically at next release version?

And programmer not need write .hs-boot file, then programmer's life will
be more easier.

Thanks!

  -- Andy