def Foo(
def foo_bar_42(
def _(
def foo_ ()

----------------------------------------------------

[
	["keyword", "def"], ["function", "Foo"], ["punctuation", "("],
	["keyword", "def"], ["function", "foo_bar_42"], ["punctuation", "("],
	["keyword", "def"], ["function", "_"], ["punctuation", "("],
	["keyword", "def"], ["function", "foo_"], ["punctuation", "("], ["punctuation", ")"]
]

----------------------------------------------------

Checks for functions.