Since there is no NullPointerException anymore, I'm closing this ticket as 'resolved'.
The problem that 'constant a = a' does not work as expected is handled in another ticket: https://rt.perl.org/Ticket/Display.html?id=111674
[perl #120254] [BUG] NullPointerException when assigning a constant to itself on Rakudo/JVM
Christian Bartolomaeus via RT Tue, 10 Mar 2015 05:10:34 -0700
