[Yhc] Re: CAF vs 0-arity function question

[Simon Marlow]

Robert Dockins wrote:
> 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 ;)

Maybe a 0-arity function is a non-updatable CAF?

Cheers,
	Simon