evalable6

query

sub prefix:<#> { $^hex; }; say #242424;

result

(exit code 1) 
===SORRY!===
Argument to "say" seems to be malformed
at /tmp/sXWG53F8it:1
------> sub prefix:<#> { $^hex; }; say⏏ #242424;
Other potential difficulties:
    Unsupported use of bare "say"; in Perl 6 please use .say if you meant to call it as a method on $_, or use an explicit invocant or argument, or use &say to refer to the function as a noun
    at /tmp/sXWG53F8it:1
    ------> sub prefix:<#> { $^hex; }; say⏏ #242424;