[perl #126827] [BUG] Class declaration from one module not visible if another module is loaded after it with a very similar class declaration in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #126827]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=126827 >


$ perl6 --version
This is rakudo version 2015.11-379-gfdec627 built on MoarVM version
2015.11-34-gc3eea17 implementing Perl v6.b.

$ cat foo.t
use B;

say X::Y::B;

$ cat bar.t
use B;
use C;

say X::Y::B;

$ cat lib/B.pm
class X::Y::B {}

$ cat lib/C.pm
class X::Y::C {}

$ perl6 foo.t
(B)

$ perl6 bar.t
Could not find symbol '&B'
  in block <unit> at bar.t:4

Actually thrown at:
  in block <unit> at bar.t:4

---

Expected behavior: bar.t should work, and print what foo.t prints.

I did a quick bisect of Rakudo, and
87288285f6f398ec7cba0900312ced4b580d79ed turns out to be the commit
that introduces the above bug.