module Foo
module_function
def foo(x)
x
end
end
class Bar
include Foo
def bar
foo(:y)
end
end
Foo.foo(:x)
Bar.new.bar
__END__
# Classes
module Foo
def foo: (:x | :y x) -> (:x | :y)
def self.foo: (:x | :y x) -> (:x | :y)
end
class Bar
include Foo
def bar: -> (:x | :y)
end