unboxed types

[Isaac Dupree]

I guess boxed types are too risky for efficiency reasons in some parts 
of the code (close examination of -ddump-simpl would be needed I guess), 
so I'll expand utils/FastTypes and put all the #ifdefs in there.

Unboxed tuples that are used in little areas of GHC code solely for the 
efficiency of not containing _|_ nor polymorphism are a nuisance 
syntactically.  Can I
#ifdef __GLASGOW_HASKELL__
#define UT #
#else
#defined UT
#endif

and use (UT x, y UT)

?

Or will I have to
#define UTopen (#
#defined UTclose #)

and (UTopen x, y UTclose)

... does that seem fairly reasonable?

Isaac