Tobias,
>> add a testcase.
>>     
> Thanks.  How about the attached file of the PR?
>
>   
That's what I have done so far (see attached).  However, in the course 
of the investigation, I found that parentheses were not working 
correctly.  I'll add a tests of that too.

We need to add the IVS testsuite to cp2k and all the others:-)

Paul