(lambda x x)

(lambda |some name| |some name|)

(lambda (x) x)

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

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

[
	["punctuation", "("],
	["keyword", "lambda"],
	["lambda-parameter", "x"],
	" x",
	["punctuation", ")"],

	["punctuation", "("],
	["keyword", "lambda"],
	["lambda-parameter", "|some name|"],
	["identifier", "|some name|"],
	["punctuation", ")"],

	["punctuation", "("],
	["keyword", "lambda"],
	["punctuation", "("],
	["lambda-parameter", "x"],
	["punctuation", ")"],
	" x",
	["punctuation", ")"],

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

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

Checks for lambda parameters.
