List.roundrobin does not work as a method on List objects.

[Xliff]

List.roundrobin does not work as a method on List objects. See the following output:

• Working
  m: say (roundrobin ((1, 2, 3), (4, 5), (6, 7, 8, 9)))
  rakudo-moar 1ee89b5: OUTPUT: «((1 4 6) (2 5 7) (3 8) (9))␤»

• Not working
  m: ((1, 2, 3), (4, 5), (6, 7, 8, 9)).roundrobin.say
  rakudo-moar 1ee89b5: OUTPUT: «No such method 'roundrobin' for invocant of type 'List'␤ in block at line 1␤␤»

I would expect, the output to be the same for both invocations listed above. As per the docs, roundrobin is listed as a method of List objects.

• Operating system:

This has been tested under a 32-bit Linux VM, and reproduced on camelia in the #perl6 IRC channel.

• Compiler version (perl6 -v):

This is Rakudo version 2017.10-4-g4fca94743 built on MoarVM version 2017.10
implementing Perl 6.c.

[zoffixznet]

I'm −⅓ on making this a method and would propose the docs to be fixed instead.

Thematically this routine operates on a bunch of lists so making it a method on a list is a bit outside of that, despite the subroutine using +@ slurpy semantics.

[Xliff]

Would a fix on the docs simply involve a change of "method" to "sub"?

[zoffixznet]

Pretty much, plus signature change to sub roundrobin(+list-of-lists) or something along those lines.

[AlexDaniel]

I'm −⅓ on making this a method and would propose the docs to be fixed instead.

I was convinced that we had a .zip method, but turns out that we don't (only for supplies but that's unrelated). So yeah, I'm not sure what is the justification for having it.

-⅔, I think this is rejectable once a ticket for docs is created (or if it's fixed right away).