From tokuhirom@gmail.com

Here is a code set.

==> foo.t <==
use v6;

class C​::T {
}

use C​::B;

C​::B.a()

==> lib/C/B.pm <==
use v6;
unit class C​::B;

method a() {
  my $pkg = 'C​::M';
  require :​:($pkg);
  :​:($pkg).new();
  say "DONE";
}

==> lib/C/M.pm <==
use v6;
unit class C​::M;

Run this script, then I get this message​:
ᐅ perl6-m -Ilib foo.t
Failed

Actually thrown at​:
  in method a at /Users/tokuhirom/tmp/20151010/70df67f456ea6193434a/lib/C/B.pm​:7
  in block <unit> at foo.t​:8

My Perl6 version is​:
ᐅ perl6-m --version
This is perl6 version 2015.09-210-gef814c3 built on MoarVM version 2015.09-39-g1434283

From tokuhirom@gmail.com

dynamic-loading-bug.tgz