private String generatedAnnotationType() {
    return isJavaxAnnotationProcessingGeneratedAvailable()
        ? "javax.annotation.processing.Generated"
        : "javax.annotation.Generated";
  }
Test builders and classes that are generic (as opposed to just containing properties with
generics).
value/src/it/functional/src/test/java/com/google/auto/value/gwt/GwtCompilationTest.java