components of a vector

There is this documentation:
```

i1 : help components

o1 = components -- list the components of a direct sum
*************************************************

Description
===========

components x -- produces a list of the components of an element of a free module.
...
```

But that feature doesn't work:

```

i2 : components QQ^3_1
stdio:2:1:(3): error: no method found for applying components to:
3
argument : | 0 | (of class QQ )
| 1 |
| 0 |
```