You have circular dependency between your two modules. That's not allowed.
In Bug/Acceptor.pm, instead of doing `use Bug::Visitor;`, predeclare it instead
using `class Bug::Visitor {...}`. (Yes, those are three literal dots in the
source code.)
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I'm leaving the ticket open for now, because I don't know if the cyclic
dependency should be detected by the compiler. Currently, it just keeps eating
more and more RAM until the kernel kills the program.
Minimalist test case to reproduce the problem:
➜ echo "use B;" > A.pm
➜ echo "use A;" > B.pm
➜ perl6 -I. -e 'use A'
