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Announce: Rakudo Perl 6 compiler, Release #124 (2018.06)

On behalf of the Rakudo development team, I’m very happy to announce the June 2018 release of Rakudo Perl 6 #124. Rakudo is an implementation of Perl 6 on the Moar Virtual Machine[^1].

This release implements the 6.c version of the Perl 6 specifications. It includes bugfixes and optimizations on top of the 2015.12 release of Rakudo.

Upcoming releases in 2018 will include new functionality that is not part of the 6.c specification, available with a lexically scoped pragma. Our goal is to ensure that anything that is tested as part of the 6.c specification will continue to work unchanged. There may be incremental spec releases this year as well.

The tarball for this release is available from

Please note: This announcement is not for the Rakudo Star distribution[^2] — it’s announcing a new release of the compiler only. For the latest Rakudo Star release, see

The changes in this release are outlined below:

New in 2018.06:

  • Fixes:
    • Fixed numeric values in Signal enum [aa622a95][852c1bd3][f2b50378] [774ec5a0][189c5a8a][b19cc4bd][c661c03c][5603771f][bfcfa5da] [7e5a862e][cd8d0445]
    • Fixed long class names being cut off in X::TypeCheck message [a79de429]
    • Many improvements to POD parsing [75430ac9][cb66dfcc][6f1b1cb6] [e1e7e4c6][cc28ce37][e776ded7][54aa17c6]
    • Fixed code execution in elided duplicate argument pair values [fc57f9f0][73297600]
    • Fixed use isms <Perl5> for rand [d1d31fd5]
    • Fixed miscompilation of chain ops [c10b1eec]
    • Fixed home path when setting up repositories [91b211ac][d06e70c3]
    • [JVM] Implemented canStore in RakudoContainerSpec [704b893c]
  • Additions:
    • Made is DEPRECATED work on attributes with auto-generated accessors [7e3aa2f2]
    • Added :api<something> in preparation for full zef / ecosystem support [affc218f]
    • Added .perl method to Distributions [18f9de61]
  • Removals:
    • Removed backwards compatibility with installers using the old Distribution class [2acbe7fc]
    • Moved pack/unpack support to lib/experimental.pm6 [9472fdfd][edc6ac6b]
    • Renamed use p5isms to more general use isms <Perl5> [4109ce36] [c80ea2f2][56dbd735][148d7c56][95aa77c9]
  • Efficiency:
    • Streamlined creation of HyperWorkBatchIterator [20bf96f9]
    • Made .minpairs/.maxpairs about 25% faster [788cda94]
    • Privatized a lot of methods for (now) better performance [c940a0ed][ec5e51c8][7284a30f][c49bbc93][0ac5c4ff][09a9bbc0] [caafcb38][0c265d49][48864774][0e835805][5621b262]
    • Added spesh plugin support [192083f6]
    • Made private method calls 6.6x faster (spesh plugin) [51ff83c7]
    • Made qualified method calls 12x faster (spesh plugin) [f6f43d58]
  • Internal:
    • Moved &DEPRECATED to Rakudo::Deprecations.DEPRECATED [472f6e48] [89a4cf0d][afbbf8f8][2fa08d5e][874ead51]
    • Turned Hash.BIND-KEY into multis [1c1acbc2]
    • Various NQP ↔ Perl 6 fixes [e4ecf5e5][23af3491][7bc6e46f][cbb5ee5f]

The following people contributed to this release:

Elizabeth Mattijsen, Will "Coke" Coleda, Jonathan Worthington, Aleks-Daniel Jakimenko-Aleksejev, Zoffix Znet, Jeremy Studer, Rafael Schipiura, 陈梓立, Tom Browder, Samantha McVey, Christian Bartolomäus, Juan Julián Merelo Guervós, Stefan Seifert, Christian Sánchez, Daniel Green, Ben Davies, Nick Logan, Luca Ferrari, Claudio Ramirez, Paweł Murias, Bruce Gray, Tison, Ronald Schmidt, Timo Paulssen, Rob Hoelz, Luis F. Uceta, dmaestro, Jonas Kramer, Moritz Lenz, Jan-Olof Hendig, KlappeZuAffeTot, Jack Kuan, Brad Gilbert, İsmail Arılık

as well as Bart Wiegmans

If you would like to contribute or find out more information, visit,, ask on the mailing list, or ask on IRC #perl6 on freenode.

Additionally, we invite you to make a donation to The Perl Foundation to sponsor Perl 6 development: (put “Perl 6 Core Development Fund” in the ‘Purpose’ text field)

The next release of Rakudo (#125), is tentatively scheduled for 2018-07-21.

A list of the other planned release dates is available in the “docs/release_guide.pod” file.

The development team appreciates feedback! If you’re using Rakudo, do get back to us. Questions, comments, suggestions for improvements, cool discoveries, incredible hacks, or any other feedback – get in touch with us through (the above-mentioned) mailing list or IRC channel. Enjoy!

Please note that recent releases have known issues running on the JVM. We are working to get the JVM backend working again but do not yet have an estimated delivery date.

[^1]: See

[^2]: What’s the difference between the Rakudo compiler and the Rakudo Star distribution?

The Rakudo compiler is a compiler for the Perl 6 language. Not much more.

The Rakudo Star distribution is the Rakudo compiler plus a selection of useful Perl 6 modules, a module installer, Perl 6 introductory documentation, and other software that can be used with the Rakudo compiler to enhance its utility.