function_feature.test

void foo(int a) {}
foo(0);

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[
	["keyword", "void"],
	["function", "foo"],
	["punctuation", "("],
	["class-name", "int"],
	["variable", "a"],
	["punctuation", ")"],
	["punctuation", "{"],
	["punctuation", "}"],

	["function", "foo"],
	["punctuation", "("],
	["number", "0"],
	["punctuation", ")"],
	["punctuation", ";"]
]

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Checks for functions.