indent of code block in multi-line iterator chain does not match `for`

This is probably a consequence of the code which tries to line up `.` in call chains, but the following example indents oddly for me:

``` rust
fn main() {
    for x in foo.iter()
                .map(|x| x * 2) {
                    let y = 22; // I expect this to be aligned with the `for`!
                }
}
```
