RE: HEAD: the `impossible' happened, MacOS X

> This is yesterdays HEAD:
> 
> ../../ghc/compiler/ghc-inplace -H32m -O0 -W 
> -fno-warn-unused-matches -fwarn-unused-imports -L/sw/lib 
> -fglasgow-exts -cpp -Iinclude -#include HsBase.h 
> -funbox-strict-fields -package-name base -dcore-lint -W 
> -fno-warn-unused-matches -fwarn-unused-imports -keep-hc-files 
>      -c System/Random.hs -o System/Random.o  -ohi System/Random.hi
> 
> System/Random.hs:15:
>     Warning: Module `GHC.IOBase' is imported, but nothing 
> from it is used
>            (except perhaps instances visible in `GHC.IOBase')
> ghc-5.05: panic! (the `impossible' happened, GHC version 5.05):
>       ASSERT failed! file stgSyn/CoreToStg.lhs line 188
> randomIvalDouble1 {- v s2Im -}

Compiling the libraries without -O is not usually a good idea, but
nevertheless the compiler shouldn't crash.  I'll take a look.

Cheers,
        Simon