==================
Comments
==================

# x = 1;
# unassigned_variable
x # xyz

---

(source_file
	(comment)
	(comment)
	(expression
		(identifier))
	(comment))

==================
Identifiers
==================

variable_name
_unused_variable
__strange_format__
a
blahblah
x.x

---

(source_file
	(expression
		(identifier))
	(expression
		(identifier))
	(expression
		(identifier))
	(expression
		(identifier))
	(expression
		(identifier))
	(expression
		(identifier)))

==================
Operators
==================

+ - = / & |

---

(source_file
	(expression
		(operator)
		(operator)
		(operator)
		(operator)
		(operator)
		(operator)))

==================
Expressions
==================

x_x = 1;

---

(source_file
	(expression
		(identifier))
		(operator)
		(integer)))