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The Path to Raku

This document describes the steps to be taken to effectuate a rename of Perl 6 to Raku, as described in issue #81. It does not pretend to be complete in scope or in time. To change a name of a project that has been running for 19+ years will take time, a lot of effort and a lot of cooperation. It will affect people in foreseen and unforeseen ways.

Language changes


The .perl method should be deprecated in 6.f, and removed in 6.g. It should be replaced by a .raku method, which will be specified in 6.e (Rakudo can provide for it as soon as implemented). This could be implemented by a global search/replace of .perl to .raku (both in method names and in calls) in src/core, src/Perl6 and lib. A new Mu.perl method should be added that will later come to issue a DEPRECATED message, and then delegate to .raku.

To retain compatibility with modules that declare a method perl, the default raku method should check if the type in question has a non-default perl method (that is, not the one from Mu) and, if so, call it. Once .perl is deprecated, it should issue the deprecation warning also.

Renaming to .code currently clashes with CallFrame.code, visually clashes with the .codes method, and it being a generic name, probably also clashes with modules and other code that exists in the wild.

$*PERL and Perl

$*RAKU and the Raku class will be the replacement of $*PERL and the Perl class, which initially will just be aliases. At a language boundary switch, they will become actual type declarations.


A RAKULIB environment variable will be introduced into a Rakudo release, and specified as part of 6.e. If found in the environment, it will be used in favor of PERL6LIB. From 6.f, use of PERL6LIB will issue a deprecation warning.


This was only very recently introduced, and is likely not in wide use yet. We could consider immediately replacing it with RAKU_HOME in an upcoming Rakudo release, perhaps with a short-term fallback/warning - or error - if it's missing, but PERL6_HOME is found.


The use isms <Perl5> should NOT be changed to use isms <Perl>. Similarly use Foo:from<Perl5> and the :lang parameter to EVAL should not be changed as to allow more flexibility should the Perl 5 community decide on a name change as well.


Because the next language release (6.e) may not coincide with the rename, no changes to versioning of the language need to be done. The next release will however be a Raku release, but should be otherwise completely compatible with previous releases.

A new language version would be the opportunity to make the name change more widely known with associated marketing efforts. But this will not be with the next (monthlyish) release.

Given we are no longer forced to have "6" in the version, there are now more options to do language versioning properly, and this aspect will need to be discussed separately at a later time.


The acronym for NQP is Not Quite Perl. It stays that way, so no changes to documentation are needed. Generally, the MoarVM / NQP construct should not matter a lot for the average user.

Documentation changes

Wherever Perl 6 is mentioned in the documentation, this should be changed to Raku. A mention of Perl 6 in the glossary should remain, and maybe in the documentation of the .perl (to be renamed to .raku) method.

A mention to Perl 6 should only occur when a redirect from has been detected / or a special URL to redirect to has been followed (e.g.

Website changes

Websites that have perl6 in their name, should redirect to their equivalent with a 301 (Moved Permanently). Some way should be devised that if someone is redirected, that a small explanation of the name change is offered and that the visitor is indeed at the place they were planning to be.

IRC Channels

The IRC channels used by Perl 6 users on freenode (#perl6*) will need to be renamed or closed / opened with the new name (#raku*). New joins should be forwarded to the new channels. will need to be asked to log these channels, so that we can have backlog again. Unfortunately, it appears to be too difficult to migrate #perl6 logs, so the same approach that was done when the #perl6-dev channel was created, will need to be followed. So searching the logs will need to be done on the old names.

Further down the road, it would probably be a wise idea to make IRC channel logging one of the infrastructure tasks.

External references

Many places on the Internet refer to Perl 6. These references will need to be changed to Raku, with a small explanation of the name change. This should be a coordinated effort to avoid duplicity of work, and to make sure that the explanation of the name change is consistent.

Many sites, such as Reddit and StackOverflow, use implicit / explicit perl6 tags. These will need to be changed or have a raku tag added, possibly with cooperation of the administrators. It should be prevented that "Perl 6" all of a sudden becomes hard to find on these sites.

Sites such as PerlMonks appear to be really Perl (aka Perl 5) focused, and could possible make that clear in their description, or change their description to specifically include Raku. It would look like the /r/perl Reddit description can be changed to indicate that only Perl 5 questions are on topic there.

Technical changes

All technical changes should make sure that all existing scripts continue to work without change in the foreseeable future. Additional DEPRECATED messages will be introduced at point of a 6.e language change.


As some packagers have already done, the executable should be called rakudo, since rakudo is the name of the implementation. raku and perl6 should be symlinks. If at all technically possible, running a script using the perl6 as the executor should provide a DEPRECATED warning at some point.


The extension .raku for scripts, .rakumod for modules, and .rakudoc for documentation (POD6) to become the defacto standards for files containing Raku code or documentation. The old .pm, .pm6 and .pod6 extensions will continue to be supported for 6.e. In 6.f, the .pm, .pm6 and .pod6 extensions could be marked as DEPRECATED, causing a message to be generated when possible.

For testing, the extensions .rakutest and .t should be used, while the extension .t6 will continue to be supported for 6.e, with deprecation messages appearing from 6.f onward.

Tools and editors should support both .rakutest and .t extensions. .t extension is shared by other languages, so editors that can interpret shebangs or have other heuristics should use these means to disambiguate raku .t files from test files written in other languages. Editors and tools that are raku-oriented (like Comma, zef, etc.) should assume that .t files without a shebang are Raku test files.

On Windows, installers should add a .raku association alongside the .p6 association for the time being. Around the time of 6.f, a .p6 association could be deselected by default, and perhaps dropped entirely by 6.g.

Here are some examples of filenames with new extensions:

  • Set.rakumod
  • HyperSeq.rakumod
  • ThreadPoolScheduler.rakumod
  • ForClass.rakumod
  • ForClass.rakudoc
  • 01-basic.rakutest

Shorter extensions were considered but no good candidates were found. For example, .rk* cannot be used because of their unfortunate similarity to Racket language file extensions (which uses .rkt) and other direct conflicts with various formats.

There won't be any additional changes to extensions in the near future. That is, no alternatives (like shorter variants) will be supported, and the extensions mentioned in this document are final.


Roast continues to be the specification of the language. Only the name of the language it specifies, changes. Internal references to Perl 6 will need to be changed.


Camelia will remain the mascot. The only thing that should change there is that it is the mascot of Raku rather than Perl 6. The fact that the wings contain a "P" and a "6" is obscure enough to not be an issue, and could be seen as a lasting tribute (easter egg) to the origin of "Raku".

Marketing changes

Renaming Perl 6 to Raku is an event that should be used to get maximum marketing result. This will need Raku marketing materials. Announcement should be coordinated, e.g. by a blog post on or similar outlets, followed up by links on the various social media outlets, such as Twitter, Facebook, Hacker News, Reddit, etc.

Specific attention should be given for the announcement of Raku in non-latin script countries (such as India, Japan, China, Taiwan) by making sure any announcements are also translated into appropriate languages for these regions. Raku, with its more than excellent Unicode support, should be able to make a big splash for developers in those regions.

Social Media

Users who want to blog about Raku are suggested to always at least mention Raku Programming Language in their blog post or in the boilerplate of their blogging engine (exactly that string, for better TIOBE rating). Mentioning of Perl 6 in such blog posts should only be done if the blog post is actually about the renaming process or historical matters.

When using social media that use hash-tags, users are suggested to use the #rakulang hash-tag, and not use the #perl6 hash-tag, unless the post is actually about the renaming process or historical matters.

Of course, the same applies to more official social media usage by the core development team.

Ecosystem changes

From the standpoint of users, there should not be any change: zef should continue to do what it does. The information about what is in the ecosystem, is not related to the "perl 6" name at the moment, so does not need any change either.

On PAUSE, Perl 6 distributions are automatically uploaded to a "Perl6" subdirectory, but this is completely transparent to both the author as well as anything else that needs to look at that as long as a file META6.json exists in the distribution. So for the foreseeable future, no changes will be needed there.

Should PAUSE decide to no longer support Raku modules in its system, then alternatives will need to be found and/or implemented.

Effects on modules in ecosystem

A guide for existing module developers will be provided, which will offer suggestions of what to do about the rename. If we can generate PRs that's perhaps also helpful, though we might want that to be opt-in: authors with a load of modules might be unpleasantly surprised to wake up one morning to an inbox full of PRs.

Such a guide should help authors with modules that either mention "perl6" or "p6" in their repo name, or mention "Perl 6" in their documentation.

A proposed draft of such a guide is included at the end of this document.

Effects on running sub-projects

Projects, such as Comma and Cro do not need any notifications, but other sub-projects may need to get advance notice. An inventory of these sub-projects will need to be made, and their maintainers be notified individually, rather than through social media. This is both to stress the urgency for a change, and to be able to present a "clean slate" to the general public when announcements about the name change are made through social media.

Effects on books

Currently printed copies of books will probably need a sticker like "Covers the new exciting Raku programming language".

Perl 6 books that have been open sourced, can be adapted by the community or the original author: a "Migration Guide for Book Authors" should help authors with this. Since ebook sales currently outperform printed books by an order of magnitude, preparing another version of an ebook should be a relatively small effort, which can actually be distributed among many individuals using modern source control techniques.

Effects on the Perl community

There is a (small) part of the Perl community that welcome the rename, as they don't want anything to do with the language and are glad to disassociate it from the Perl name. There are community members with an active interest in both Perl 5 and Raku, and some of those who only do one or the other still feel there is much to be learned from, and shared with, each other, especially given the many shared design values of the languages.

The name change of Perl 6 to Raku is also intended to have a healing effect on a community that has been effectively split for many years. It is the hope of the Raku core development team that future events will continue to cater for both Perl as well as Raku presentations.

Effects on user groups

Each Perl user group (Perl Monger group) will have to decide for themselves what they want to do with this new situation. More active groups in the past years, have started using the services of online meeting organizers such as MeetUp. To indicate the changed situation, it may be a good idea to change the names of such groups, e.g. from "Foo Perl Mongers Meeting" to "Foo Perl Family Meetup" or "Foo Perl Community Meetup". Should a user group decide to only focus on Perl 5 or Raku only, then they are of course open to not change their name, or to change it to something like "Foo Raku Meetup". This could coincide with the official announcement, and maybe special events to celebrate the name change.

Effects on events

Event organizers are, as always, completely free in the naming of their events. If an event would like to cater for both Perl and Raku attendees, then this should be reflected in the name of the event. An event with just Raku in its name, would appear to cater only for attendees interested in Raku. An event with just Perl in its name, would appear to cater for attendees interested in Perl 5 only. Suggestions for naming events are (where "Foo" is a place / country name):

The Foo Perl Community Workshop
The Foo Perl Family Workshop
The Foo Perl and Friends Workshop
The Foo Perl and Raku Conference
The Foo Raku and Friends Workshop

etc. etc.

Relationship with The Perl Foundation

No changes should be necessary with regards to the relationship with The Perl Foundation. But this is mostly up to The Perl Foundation. A suggestion would be to make the website of The Perl Foundation more general: a Perl Family. With equal attention for Perl, Raku, RPerl and CPerl, and emphasis on continued development on all projects.

Should The Perl Foundation decide to not want to have anything to do with Raku, only then should an alternate organisational support be discussed.

However, since "Yet Another Society" is doing business as "The Perl Foundation", maybe it is an idea to create another "doing business as" called "The Raku Foundation". Which would make it clear that "The Perl Foundation" is for Perl 5 only, whereas "The Raku Foundation" would be for Raku only. While both are part of the Perl Mindset in the "Yet Another Society".

Draft guide for module developers

The Raku team are grateful to all those who have developed modules for the language. We recognize that most contributors are doing so on a volunteer basis, and that this work is often done in one's (lack of) free time.

This guide provides some suggestions on how module authors can handle the Perl 6 to Raku renaming. While there is a suggested timeline here, it is to be interpreted as "at your convenience", rather than an expectation to do these things quickly.

In the period immediately after the rename is agreed...

You might consider:

  • Mentioning Raku in your module's README or other documentation. It's up to you if you wish to have something like "Raku (formerly Perl 6)", to stay findable for such searches for some time, or to simply adopt the Raku name right away.
  • Renaming the GitHub repository if it contains p6 or perl6 (remember to update the sources entry in META6.json if doing this).

In this interest of your module continuing to work with existing Rakudo installations, please do not, at this point:

  • Change module file extensions away from .pm6
  • Rely on .raku, Raku, $*RAKU, and similar

Around the release of 6.e...

This is expected to happen in 2020. At this point, you might consider:

  • Changing module file extensions (remembering to update META6.json)
  • Switching to use .raku, Raku, $*RAKU, and similar in the module's code (most modules will not be doing this anyway)
  • Dropping remaining mentions of Perl 6 in the documentation, unless it is there for historical interest
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