test.pl

#!/usr/env/bin perl6
use v6;

{
    my $foo = 'Foo';
    require $foo;
    my $obj = $foo.new;
    say $obj;
    say $obj.bar;
}

{
    my $bar = 'Foo::Bar';
    require $bar;
# my $obj = $bar.new; # this fails with 'Null PMC access in get_repr()'
    my $obj = eval "{$bar}.new";
    say $obj;
    say $obj.baz;
}