gistfile1.java

@JRubyMethod(name = "initialize", visibility = Visibility.PRIVATE, compat = CompatVersion.RUBY1_9)
    public IRubyObject initialize19(ThreadContext context, Block block) {
        if (!block.isGiven()) {
            throw context.getRuntime().newArgumentError(0, 1);
        } else {
            // I DON'T KNOW WHAT TO DO WITH THE BLOCK
            return null;
        }
    }