==================
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))))