node_modules/prismjs/tests/languages/lua/function_feature.test

foo ()
Foo_bar_42()
foo {}
Foo_bar_42{}

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[
	["function", "foo"], ["punctuation", "("], ["punctuation", ")"],
	["function", "Foo_bar_42"], ["punctuation", "("], ["punctuation", ")"],
	["function", "foo"], ["punctuation", "{"], ["punctuation", "}"],
	["function", "Foo_bar_42"], ["punctuation", "{"], ["punctuation", "}"]
]

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Checks for functions.