[perl #129812] [OPTIMIZER] `is rw` candidates get called even if a non-rw argument is passed

[Jan-Olof Hendig via RT]

On Wed, 05 Oct 2016 14:23:57 -0700, c...@zoffix.com wrote:
> 
> This code shows the bug:
> 
>      zoffix@leliana:~$ perl6 -e 'm: multi foo ($) {"right" }; multi  
> foo ($ is rw) {"wrong"}; say foo "42"'
>      wrong
> 
> And if we turn off the optimizer, we get the right candidate called  
> (same would happen if we add more complex sub bodies, so possibly the  
> sub gets inlined):
> 
>      zoffix@leliana:~$ perl6 --optimize=off -e 'm: multi foo ($)  
> {"right" }; multi foo ($ is rw) {"wrong"}; say foo "42"'
>      right
> 

It would seem that this bug was fixed with 
https://github.com/rakudo/rakudo/commit/f8b3469439108fead043bab2bd27bde4bac50dca
Test(s) needed