-- main.mcl --
$lambda = func($x) {
	$x + "!"
}

test [$lambda("hello"),] {}
-- OUTPUT --
Edge: _operator -> composite: []str # 0
Edge: const: str("!") -> _operator # b
Edge: const: str("+") -> _operator # op
Edge: const: str("hello") -> _operator # a
Vertex: _operator
Vertex: composite: []str
Vertex: const: str("!")
Vertex: const: str("+")
Vertex: const: str("hello")