A singleton class

Methods
A
D
Instance Public methods
ancestors()

Adds the superclass to the included modules.

Source: show | on GitHub 

# File ../ruby/lib/rdoc/single_class.rb, line 11
def ancestors
  superclass ? super + [superclass] : super
end
definition()

The definition of this singleton class, class << MyClassName

Source: show | on GitHub 

# File ../ruby/lib/rdoc/single_class.rb, line 18
def definition
  "class << #{full_name}"
end