class SyntaxTree::YARV::VM::NullEvents

us to implement tracing.
This is the main entrypoint for events firing in the VM, which allows

def publish_frame_change(frame) 

def publish_frame_change(frame)
end

def publish_instruction(iseq, insn) 

def publish_instruction(iseq, insn)
end

def publish_stack_change(stack) 

def publish_stack_change(stack)
end

def publish_tracepoint(event) 

def publish_tracepoint(event)
end