新增调试信息

libcore/node_modules/read-only-stream/example/main.js

@@ -0,0 +1,3 @@
+var wrap = require('./wrap.js');
+var ro = wrap(); // can't write to `ro` and muck up internal state
+ro.pipe(process.stdout);

libcore/node_modules/read-only-stream/example/wrap.js

@@ -0,0 +1,8 @@
+var through = require('through2');
+var readonly = require('../');
+
+module.exports = function () {
+    var stream = through();
+    stream.end('wooooo\n');
+    return readonly(stream);
+};