rafa/docs/Stream-error.md

Rafa.js is a Javascript framework for building concurrent applications.

Return a new child stream that handles all errors that pass 
through the stream. Return values from the handler function have to affect
on values sent to child streams (cannot be transformed).

<aside>
```js
// # error(unit: A => undefined): Stream
var stream = Rafa.stream();
var error = null;

stream.error(e => error = e.message);

stream.write(new Error(23));

// error: 23;
```
</aside>