moar CStruct repr precomp bug

foo.pm6

use v6;
use NativeCall;
class foo is repr('CStruct'); # works fine without the repr('CStruct')

has CArray $!foo;

method set-foo(CArray $arr) {
    $!foo := $arr;
}

terminal

> perl6 -I. user.pl
alive
> perl6 --target=mbc --output=foo.moarvm foo.pm6
> perl6 -I. user.pl 
Can not bind non-existent attribute '$!foo'
  in method set-foo at foo.pm6:8
  in block  at user.pl:6

> 

user.pl

use foo;
use NativeCall;

my $arr = CArray[int8].new;
$arr[0] = 42;
foo.new.set-foo($arr);
say 'alive';