==================
Variable expansion
==================

a { out "\$var" }

---

(source_file
 (function
  (function_name)
  (command
   (command_name)
   (string
	(quoted_literal
	 (variable_expansion (variable_name)))))))

===========================
Protocol argument expansion
===========================

a { out "\$1" }

---

(source_file
 (function
  (function_name)
  (command
   (command_name)
   (string
	(quoted_literal
	 (variable_expansion (variable_name)))))))
