Prompt validation does not visualize the output (errors)

using inquirer a prompt with validate function should show the validate output, but with vorpal it is somehow omitted.

``` js
this.prompt([
{
type: 'input',
name: 'test',
message: 'Please type something different than `test` to see an error pop up... or type `test` to continue',
validate: function (val) {
if (val != 'test') {
return "Please answer with the word test";
}
return true;
}
}
], function(answers) {
console.log(answers);
});
```

in Inquirer you can see this work perfectly in the `examples/input.js` example. however the error gets lost somewhere in the process within vorpal I assume.