static String generatedAnnotationType() {
    return SourceVersion.latestSupported().compareTo(SourceVersion.RELEASE_8) > 0
        ? "javax.annotation.processing.Generated"
        : "javax.annotation.Generated";
  }
Returns the qualified name of the {@code @Generated} annotation available during a compilation
task.
value/src/test/java/com/google/auto/value/processor/GeneratedImport.java