code: private static void generateArmProxyMatcher(final CodeBlock block)
      {
          block.dup_x1()
              .checkcast(CodegenUtils.p(Matcher.class))
              .invokevirtual(CodegenUtils.p(ProxyMatcher.class), "arm",
                  CodegenUtils.sig(void.class, Matcher.class));
      }
docs: <proxyMatcher>.arm(<rule>)