-- main.mcl --
# this should be a function as a value, iow a lambda
$prefixer = func($x) {
	"hello" + $x	# i'd only ever expect one "hello" string in the graph
}

$out1 = $prefixer("a")
$out2 = $prefixer("b")

test "${out1}" {} # helloa
test "${out2}" {} # hellob
-- OUTPUT --
Edge: const: str("+") -> _operator # op
Edge: const: str("+") -> _operator # op
Edge: const: str("a") -> _operator # b
Edge: const: str("b") -> _operator # b
Edge: const: str("hello") -> _operator # a
Edge: const: str("hello") -> _operator # a
Vertex: _operator
Vertex: _operator
Vertex: const: str("+")
Vertex: const: str("+")
Vertex: const: str("a")
Vertex: const: str("b")
Vertex: const: str("hello")
Vertex: const: str("hello")