gistfile1.txt

module MySubModule
end

module MyModule
  include MySubModule
end

class MyClass
  include MyModule
end

class MyBasicClass < BasicObject
end

p MyModule.ancestors
# => [MyModule, MySubModule]
#
# should fallback to G(object)
# first mod(=MyModule) isn't G(class) and G(object) isn't found in the superclass chain.

p MyClass.ancestors
# => [MyClass, MyModule, MySubModule, Object, Kernel, BasicObject]
#
# should fallback to G(object)
# first mod(=MyClass) is G(class) and G(object) is found in the superclass chain.

p MyBasicClass.ancestors
# => [MyBasicClass, BasicObject]
#
# should not fallback to G(object)
# first mod(=MyBasicClass) is G(class) and G(object) isn't found in the superclass chain.