Funky C-lib String Arrays with NativeCall.md

If you are trying to figure out a safe way to port C-code resembling this to perl6:

char **ptr=vc.user_comments;
while(*ptr){
    fprintf(stderr,"%s\n",*ptr);
    ++ptr;
}

Something simlar to this will do the trick:

my @uc := nativecast(CArray[Str], $vc.user_comments);
loop (my $ci = 0; @uc[$ci].defined; $ci++) {
        diag "Comment: {@uc[$ci]}";
}