class SyntaxTree::BasicVisitor::VisitMethodsChecker

a given block to ensure that they are valid visit methods.
This module is responsible for checking all of the methods defined within

def disable! 

def disable!
  status.checking = false
end

def initialize 

def initialize
  # We need the status to be an instance variable so that it can be
  # accessed by the disable! method, but also a local variable so that it
  # can be captured by the define_method block.
  status = @status = Status.new(true)
  define_method(:method_added) do |name|
    BasicVisitor.visit_method(name) if status.checking
    super(name)
  end
end