haskell-align-imports barfs on Unicode?

It seems `haskell-align-imports` does not work when the qualified name contains Unicode (like Greek characters).

Try for yourself:
```
module Test where

import qualified Prelude as Π
import Data.String as S
```

Replace `Π` with `P` and it works.

---

It seems it works as soon as one qualified import does not contain such characters.

```
module Test where

import qualified Prelude as Π
import Data.String as S
import Data.List as L
```

Is there some regexp-based filtering for qualified lines that accidentally omits lines that contain Unicode?