a {}
p, div {}
#foobar .foo {}
&:hover {}
&-sidebar {}
#context a%extreme {}
#{$selector}:before {}

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

[
	["selector", ["a "]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["p, div "]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["#foobar .foo "]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["&:hover "]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["&-sidebar "]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["#context a", ["placeholder", "%extreme"]]], ["punctuation", "{"], ["punctuation", "}"],
	["selector", ["#{$selector}:before "]], ["punctuation", "{"], ["punctuation", "}"]
]

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

Checks for selectors.