(defun foo ())
(defun foo (bar))
(defun foo (bar &body arg1) )
(defun foo (bar &rest arg1) )
(defun foo (bar &body arg1 arg2) )
(defun foo (bar &key arg1) )
(defun foo (bar &key arg1 &allow-other-keys) )
(defun foo (&optional arg1) )
(defun defabc ())

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

[
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", []], ["punctuation", ")"]]], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ]]], ["punctuation", ")"]]], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ], ["rest-vars", [["lisp-marker", "&body" ], ["argument", "arg1"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ], ["rest-vars", [["lisp-marker", "&rest" ], ["argument", "arg1"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ], ["rest-vars", [["lisp-marker", "&body" ], ["argument", "arg1"], ["argument", "arg2"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ], ["keys", [["lisp-marker", "&key" ], ["argument", "arg1"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [[ "argument", "bar" ], ["keys", [["lisp-marker", "&key" ], ["argument", "arg1"], ["lisp-marker", "&allow-other-keys"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "foo"], ["punctuation", "("], ["arguments", [["other-marker-vars", [["lisp-marker", "&optional" ], ["argument", "arg1"]]]]], ["punctuation", ")"]] ], ["punctuation", ")"],
	["punctuation", "("], ["defun", [ ["keyword", "defun" ], ["function", "defabc"], ["punctuation", "("], ["arguments", []], ["punctuation", ")"]]], ["punctuation", ")"]
]

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

Checks for defun.