-- main.mcl --
import "test"

class use_twice($test1, $test2, $x) {
	test $test1 {
		anotherstr => $x,
	}
	test $test2 {
		anotherstr => $x,
	}
}

# one_instance_e should only produce one value, and will error if initialized twice
include use_twice("test1", "test2", test.one_instance_e())

# one_instance_f should only produce one value, and will error if initialized twice
include use_twice("test3", "test4", test.one_instance_f())
-- OUTPUT --
Vertex: test[test1]
Vertex: test[test2]
Vertex: test[test3]
Vertex: test[test4]