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Announce: Rakudo Star - a useful, usable, "early adopter" distribution of Perl 6
On behalf of the Rakudo and Perl 6 development teams, I'm happy to
announce the January 2013 release of "Rakudo Star", a useful and
usable distribution of Perl 6. The tarball for the January 2013
release is available from <http://rakudo.org/downloads/star/>.
A Windows .MSI version of Rakudo star will usually appear in
the downloads area shortly after the tarball release.
In the Perl 6 world, we make a distinction between the language
("Perl 6") and specific implementations of the language such as
"Rakudo Perl". This Star release includes release 2013.01 [0] of the
Rakudo Perl 6 compiler [1], version 4.10.0 of the Parrot Virtual
Machine [2], and various modules, documentation, and other
resources collected from the Perl 6 community.
Some of the new features added to this release include:
* Sink context (what some other languages call void context) is now enforced
correctly. This means that for-loops are now lazy by default. It fixes the
bug where a map in sink context would not execute, and also means that a
Failure returned to sink context will be properly thrown.
* 'require' now works with indirect module names
* Restored socket read semantics to returning the requested number of bytes
* $obj.Some::Role::meth() now passes the correct $obj
* try/CATCH now returns Nil when the CATCH is triggered, rather than the
exception; this brings it in line with try without a CATCH
* whatever-star cases of splice now implemented
* can now import multis with the same name from different modules,
provided all dispatchers are onlystar
This release also contains a range of bug fixes, improvements to error reporting
and better failure modes.
The following features have been deprecated or modified from previous
releases due to changes in the Perl 6 specification, and are being removed
or changed as follows:
* postcircumfix:<[ ]> and postcircumfix:<{ }> will become multi-subs rather
than multi-methods. Both at_pos and at_key will remain methods.
* Unary hyper ops currently descend into nested arrays and hashes.
This will change to make them equivalent to a one-level map.
* The Str.ucfirst builtin is deprecated; it will be replaced by Str.tc.
* Leading whitespace in rules and under :sigspace will no longer be
converted to <.ws> . For existing regexes that expect this conversion,
add a <?> in front of leading whitespace to make it meta again.
* The ?-quantifier on captures in regexes currently binds the capture
slot to a List containing either zero or one Match objects; i.e., it
is equivalent to "** 0..1". In the future, the ?-quantifier will
bind the slot directly to a captured Match or to Nil. Existing code
can manage the transition by changing existing ?-quantifiers to
use "** 0..1", which will continue to return a List of matches.
There are some key features of Perl 6 that Rakudo Star does not
yet handle appropriately, although they will appear in upcoming
releases. Some of the not-quite-there features include:
* advanced macros
* threads and concurrency
* Unicode strings at levels other than codepoints
* interactive readline that understands Unicode
* non-blocking I/O
* much of Synopsis 9
There is an online resource at http://perl6.org/compilers/features
that lists the known implemented and missing features of Rakudo
and other Perl 6 implementations.
In many places we've tried to make Rakudo smart enough to inform the
programmer that a given feature isn't implemented, but there are
many that we've missed. Bug reports about missing and broken
features are welcomed at <rakudobug@perl.org>.
See http://perl6.org/ for links to much more information about
Perl 6, including documentation, example code, tutorials, reference
materials, specification documents, and other supporting resources.
A draft of a Perl 6 book is available as <docs/UsingPerl6-draft.pdf>
in the release tarball.
The development team thanks all of the contributors and sponsors
for making Rakudo Star possible. If you would like to contribute,
see <http://rakudo.org/how-to-help>, ask on the perl6-compiler@perl.org
mailing list, or join us on IRC #perl6 on freenode.
[0] https://github.com/rakudo/rakudo/blob/nom/docs/announce/2013.01
[1] http://github.com/rakudo/rakudo
[2] http://parrot.org/
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