}
    }

    private static boolean nullabilityOf(CtField field) {
        NullableFieldVisitor visitor = new NullableFieldVisitor(field.getName())
        new ClassReader(byteCodeFrom(field.getDeclaringClass())).accept(visitor, 0)
        return visitor.nullable
    }

    static class NullableFieldVisitor extends ClassVisitor {

        boolean nullable = false
        private final String fieldName