[ :i |
]
[ :a :b |
]

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

[
	["punctuation", "["],
	["block-arguments", [
		["variable", ":i"],
		["punctuation", "|"]
	]],
	["punctuation", "]"],
	["punctuation", "["],
	["block-arguments", [
		["variable", ":a"],
		["variable", ":b"],
		["punctuation", "|"]
	]],
	["punctuation", "]"]
]

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

Checks for block arguments.