Name: js-handler/node_modules/restify/node_modules/verror/examples/levels-werror.js 
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var extsprintf = require('extsprintf');
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var fs = require('fs');
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var verror = require('../lib/verror');
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function checkFile(filename, callback) {
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  fs.stat(filename, function (err) {
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    if (err)
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      /* Annotate the "stat" error with what we were doing. */
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      return (callback(new verror.VError(err,
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          'failed to check "%s"', filename)));
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    /* ... */
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    return (callback());
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  });
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}
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function handleRequest(filename, callback) {
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  checkFile('/nonexistent', function (err) {
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    if (err)
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      /* Wrap the "checkFile" error. */
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      return (callback(new verror.WError(
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          err, 'request failed')));
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    /* ... */
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    return (callback());
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  });
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}
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handleRequest('/nonexistent', function (err) {
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  if (err) {
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    console.log(err.message);
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    console.log(err.toString());
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  }
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});