.bordered {}
.@{foo} {}
.foo (@bg: #fff, @color: #000) {}

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

[
	["selector", [".bordered"]],
	["punctuation", "{"], ["punctuation", "}"],
	["selector", [".@{foo}"]],
	["punctuation", "{"], ["punctuation", "}"],
	["selector", [
		".foo (",
		["variable", "@bg"],
		": #fff, ",
		["variable", "@color"],
		": #000)"
	]],
	["punctuation", "{"], ["punctuation", "}"]
]

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

Checks for selectors and mixin declarations.