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

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