Given that Raku's design originally stems from the "strict" subset of Perl 5, this would never work. This only works when Perl runs in non-strict pre-5 mode (which is the default before 7.0).
Yeah, I bet you're right. My first thought was that all the different ways Raku has of letting you start entering a string literal might make up for that but, on second thought, those all need to have a corresponding closing pair so that wouldn't really help.
By the way, the first Raku Conference is happening in a few weeks, Aug. 6–8 https://conf.raku.org