$ javac --add-modules jdk.incubator.vector src/VectorDemo.java && java --add-modules jdk.incubator.vector VectorDemo     (21.0.12.1)
warning: using incubating module(s): jdk.incubator.vector
1 warning
WARNING: Using incubator modules: jdk.incubator.vector
vector == scalar: true
lanes >= 2      : true