[perl #124018] Differing behavior of multi grammar rules with and without "multi"

[Aleks-Daniel Jakimenko-Aleksejev via RT]

Still reproducible (2017.11, HEAD(5929887)). It does print Nil instead of
(Any), but same thing.
On 2015-03-08 09:22:25, b...@abrij.org wrote:
>
> In a grammar that uses a proto+parameterized multi, the "multi" is
> optional according to S05. However, the presence of the "multi"
> seems to prevent proper operation of this feature under certain
> circumstances:
>
> # perl6 -e 'grammar f { proto token g {*}; token g:h<i> { i* }; token
> g:h<j> { j* }; proto token l {*}; multi token l:m<n> { n* }; multi
> token l:m<o> { o* } }; f.parse("i", :rule<g>).say; f.parse("j",
> :rule<g>).say; f.parse("n", :rule<l>).say; f.parse("o",
> :rule<l>).say;'
> ｢i｣
> ｢j｣
> ｢n｣
> (Any)
>
> It seems to work fine in other circumstances. The same as above, but
> without the quantifiers yields:
>
> # perl6 -e 'grammar f { proto token g {*}; token g:h<i> { i }; token
> g:h<j> { j }; proto token l {*}; multi token l:m<n> { n }; multi token
> l:m<o> { o } }; f.parse("i", :rule<g>).say; f.parse("j",
> :rule<g>).say; f.parse("n", :rule<l>).say; f.parse("o",
> :rule<l>).say;'
> ｢i｣
> ｢j｣
> ｢n｣
> ｢o｣