Sat Nov 3 09:46:04 EDT 2007 Ian Lynagh <[EMAIL PROTECTED]>
* Add 6.8.1 download page
A ./download_ghc_681.html
i had a quick look through the release notes, and found
two issues that might be removed before release:
1 the () defaulting in ghci looks highly dubious to me;
having an 'instance Num ()', as given in the doc example,
means that all arithmetic will fail, suggesting that this hack
is far too intrusive:
*Main> 1+2
*** Exception: def.hs:1:0: No instance nor default
method for class operation GHC.Num.+
instead of meddling with a wide-ranging and subtle
feature like defaults, wouldn't it be easier to switch
off ghci's printing of io-results? or use the old standby
void m = m >> return ()
in any case, it would be nice to have a ':show defaults'
or something, so that one can see what is going on, and
wrong.
2 while looking up 8.3.7, i saw this note in 8.3.6, on
postfix operators:
"(No Haskell 98 programs change their behaviour, of course.)"
like so many "of course" notes, this is wrong, of course;-)
haskell98 has seq, and that makes eta-expansion observable.
$ /cygdrive/c/ghc/ghc-6.4.1/bin/ghc -e
'let (!) a = undefined in (undefined !) `seq` True'
True
$ /cygdrive/c/ghc/ghc-6.6.1/bin/ghc -e
'let (!) a = undefined in (undefined !) `seq` True'
*** Exception: Prelude.undefined
ah well, too late, the announcement is out already, i see.
still, the docs for 8.3.6 should be fixed, and the ()
defaulting for ghci should be revisited, i think.
claus
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