[perl #131395] Using a cross meta operator on an empty list complains about not supporting elems

[Sam S. via RT]

On Mon, 29 May 2017 11:36:49 -0700, c...@zoffix.com wrote:
> On Mon, 29 May 2017 10:02:27 -0700, thunderg...@comcast.net wrote:
> > Using a cross meta operator on an empty list complains "This type 
> > (Scalar) does not support elems".
> > 
> >      say (1,2).elems; say ().elems; say (1,2) X ();
> > 
> > yields "2␤0␤This type (Scalar) does not support elems"
> > 
> > Seems to work correctly with arrays instead of lists.
> > 
> >          say [1,2].elems; say [].elems; say [1,2] X [];
> > 
> > 
> > Linux Mint 17.2
> > 
> >  >perl6 -v
> >  >This is Rakudo version 2017.05 built on MoarVM version 2017.05 
> > implementing Perl 6.c.
> 
> 
> Thank you for the report. lizmat++ fixed the issue.
> 
> Fix: https://github.com/rakudo/rakudo/commit/9494cbd3b9
> Test: https://github.com/perl6/roast/commit/0faf3c354f

Re-opening, because it hasn't been fixed for the Xop case yet:

    ➜  say () X+ (1, 2);
    This type (Scalar) does not support elems

    ➜  say (1,2) X~ ();
    This type (Scalar) does not support elems

    ➜  say () X=> ();
    This type (Scalar) does not support elems

Bisectable¹ blames a commit² from January.


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[1] https://gist.github.com/Whateverable/f1b3066f1e2c45df7ab5e0aa7aeee3a7
[2] https://github.com/rakudo/rakudo/commit/a26f51361

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This is Rakudo version 2017.09-142-ga89add0bf built on MoarVM version 
2017.09.1-49-gb3dd812a
implementing Perl 6.c.