namespace App
namespace \foo
namespace \foo\bar\baz
use \foo
use \foo\bar\baz
use function \foo
use function \foo\bar\baz

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

[
	["keyword", "namespace"],
	["package", ["App"]],
	["keyword", "namespace"],
	["package", [["punctuation", "\\"], "foo"]],
	["keyword", "namespace"],
	["package", [
		["punctuation", "\\"], "foo",
		["punctuation", "\\"], "bar",
		["punctuation", "\\"], "baz"
	]],
	["keyword", "use"],
	["package", [["punctuation", "\\"], "foo"]],
	["keyword", "use"],
	["package", [
		["punctuation", "\\"], "foo",
		["punctuation", "\\"], "bar",
		["punctuation", "\\"], "baz"
	]],
	["keyword", "use"],
	["keyword", "function"],
    ["package", [["punctuation", "\\"], "foo"]],
	["keyword", "use"],
	["keyword", "function"],
	["package", [
		["punctuation", "\\"], "foo",
		["punctuation", "\\"], "bar",
		["punctuation", "\\"], "baz"
	]]
]

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

Checks for packages.