[Yhc] CAF vs 0-arity function question

[Robert Dockins]

The HBC bytecode format has different constant tags for the folloing: 

1) CAF, tag 'A'
2) 0-arity function, tag '0'

http://haskell.org/haskellwiki/Yhc/RTS/hbc

Why the distinction?  Maybe I don't fully understand, but I thought that a 
0-arity function _was_ a CAF?

The runtime seems to treat them very much the same (although I can't be quite 
sure -- reading C gives me a headache ;)


Rob Dockins