[1]_
[2]_
[#]_
[#foobar]_
[CIT2002]_

foobar_
foo__
foo:bar_
`foo:bar`_
`foo bar baz`__
_`inline internal target`

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[
	["link", [["punctuation", "["], "1", ["punctuation", "]_"]]],
	["link", [["punctuation", "["], "2", ["punctuation", "]_"]]],
	["link", [["punctuation", "["], "#", ["punctuation", "]_"]]],
	["link", [["punctuation", "["], "#foobar", ["punctuation", "]_"]]],
	["link", [["punctuation", "["], "CIT2002", ["punctuation", "]_"]]],

	["link", ["foobar", ["punctuation", "_"]]],
	["link", ["foo", ["punctuation", "__"]]],
	["link", ["foo:bar", ["punctuation", "_"]]],
	["link", [["punctuation", "`"], "foo:bar", ["punctuation", "`_"]]],
	["link", [["punctuation", "`"], "foo bar baz", ["punctuation", "`__"]]],
	["link", [["punctuation", "_`"], "inline internal target", ["punctuation", "`"]]]
]

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Checks for links.