==================
Single key-value
==================

LABEL key="value"

---

(source_file
	(label_instruction
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string))))

==================
Multi key-value
==================

LABEL key.1="value1" key.2="value2"

---

(source_file
	(label_instruction
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string))
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string))))

==================
Multiline
==================

LABEL key.1="value1" \
	  key.2="value2"

---

(source_file
	(label_instruction
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string))
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string))))

==================
Label
==================

LABEL key="value${FOO}"

---

(source_file
	(label_instruction
		(label_pair
			key: (unquoted_string)
			value: (double_quoted_string
				(env_spec)))))

==================
Stopsignal
==================

STOPSIGNAL $FOO

---

(source_file
	(stopsignal_instruction
		(env_spec)))

==================
User
==================

USER foo$FOO:bar$BAR

---

(source_file
	(user_instruction
		user: (unquoted_string
			(env_spec))
		group: (unquoted_string
			(env_spec))))