module Ivar::Checked::InstanceMethods

def self.prepend_features(othermod)

file and line number.
(like, say, initialize), we have to stash the original method implementation if we ever want to find out its
The semantics of prepend are such that the super method becomes wholly inaccessible. So if we override a method 
def self.prepend_features(othermod)
  (instance_methods(false) | private_instance_methods(false)).each do |method_name|
    Ivar.stash_method(othermod, method_name)
  end
  super
end

def initialize(*args, **kwargs, &block)

3. Checking instance variables for validity
1. Processing manifest declarations before calling super
This method handles the initialization process, including:
Wrap the initialize method to automatically call check_ivars 
def initialize(*args, **kwargs, &block)
  if @__ivar_skip_init
    super
  else
    @__ivar_skip_init = true
    manifest = Ivar.get_or_create_manifest(self.class)
    manifest.process_before_init(self, args, kwargs)
    super
    check_ivars
  end
end