[perl #70229] [BUG] Failure stringifies to '' in Rakudo, shouldn't

[Carl Mäsak via RT]

> Current implementation:
> 
> 11:55 < [Coke]> rakudo: say 1 ^^ 1
> 11:55 <+p6eval> rakudo aa8f19: OUTPUT«Nil␤»
> 11:55 < [Coke]> rakudo: say (1 ^^ 1).WHAT
> 11:55 <+p6eval> rakudo aa8f19: OUTPUT«Nil␤»

This looks fixed to me, and tested. Resolving ticket.