|x: int, y: int| -> int {}
|| {}

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

[
	["closure-params", [
		["punctuation", "|"],
		"x",
		["punctuation", ":"],
		" int",
		["punctuation", ","],
		" y",
		["punctuation", ":"],
		" int",
		["punctuation", "|"]
	]],
	["punctuation", "->"],
	" int ", ["punctuation", "{"], ["punctuation", "}"],

	["closure-params", [
		["punctuation", "|"],
		["punctuation", "|"]
	]],
	["punctuation", "{"], ["punctuation", "}"]
]

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

Checks for closure params.