Multiple languages within one code block?

As far as I understand it currently it isn't possible to have multiple languages within one code block.

Maybe multimarkdown can support this by differentiating between these scenarios?

Case 1:

```lang1
foo <- bar()
```
```lang2
xxx = zzz
```

Case 2:

```lang1
foo <- bar()
```

```lang2
xxx = zzz
```

In the first case there is no empty line between the code blocks - so they will be placed within the same `pre` with different code classes. In the second case there is a space and so different code blocks would be in their own `pre` elements.