Looks like this bug re-appeared and Rakudo's function all come down to
nqp::log_n():
<ZoffixW> m: say log 0
<camelia> rakudo-moar 2dd0dd: OUTPUT«-Inf»
<ZoffixW> m: use nqp; say nqp::log_n(0e0)
<camelia> rakudo-moar 2dd0dd: OUTPUT«-Inf»
2008 IEEE 754[^1], in section 9.2, says log(0) needs to give a divideByZero
exception.
[1] http://www.csee.umbc.edu/~tsimo1/CMSC455/IEEE-754-2008.pdf
On Wed Nov 12 07:53:52 2008, pmichaud wrote:
> On Tue, Nov 11, 2008 at 11:57:02PM -0800, Carl Mäsak wrote:
> > Rakudo r32568:
> >
> > $ ./perl6 -e 'my $result = log(0); say "Still alive after getting
> > $result"'
> > Still alive after getting -inf
>
> Now fixed in r32574:
>
> $ ./parrot perl6.pbc -e 'my $result = log(0); say $result;'
> Can't take log of 0
>
> $
>
>
> Note that instead of throwing an exception immediately, log(0)
> returns a Failure that then throws an exception if it is used.
>
> Pm
