module Ivar

def self.stash_method(klass, method_name)

Returns:

(UnboundMethod, nil) - The stashed method or nil if the method doesn't exist

Parameters:

method_name (Symbol) -- The name of the method to stash
klass (Class) -- The class that owns the method

def self.stash_method(klass, method_name)
  return nil unless klass.method_defined?(method_name) || klass.private_method_defined?(method_name)
  method_impl = klass.instance_method(method_name)
  stash = klass.instance_variable_get(:@__ivar_method_impl_stash) ||
    klass.instance_variable_set(:@__ivar_method_impl_stash, {})
  stash[method_name] = method_impl
end