(lambda (foo bar) (concat foo bar))

(lambda [foo bar] [concat foo bar])

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

[
	["punctuation", "("],
	["keyword", "lambda"],
	["punctuation", "("],
	["lambda-parameter", "foo"],
	" bar",
	["punctuation", ")"],
	["punctuation", "("],
	["function", "concat"],
	" foo bar",
	["punctuation", ")"],
	["punctuation", ")"],

	["punctuation", "("],
	["keyword", "lambda"],
	["punctuation", "["],
	["lambda-parameter", "foo"],
	" bar",
	["punctuation", "]"],
	["punctuation", "["],
	["function", "concat"],
	" foo bar",
	["punctuation", "]"],
	["punctuation", ")"]
]

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

Checks for lambda parameters.
