Function1Expression vector

Example in file Function1Expression.H for vector is not working (tested on cavity case in U file as is).

Entry in U:

    movingWall
    {
        type            uniformFixedValue;
        uniformValue
            {
            type    expression;
                 variables
            (
                "start = 0.5"
                "stop  = 1"
            );
            expression  #{mag(arg() > start && arg() < stop) * vector(1, 0, 0)  #};
           }
    }

Error message:

Reading field U

--> FOAM Warning :
    From virtual Foam::Istream& Foam::ISstream::read(Foam::word&)
    in file db/IOstreams/Sstreams/ISstream.C at line 482
    Reading "/home/matej/PROJECTS/release2006/cavity/0/U" at line 35
    Missing 1 closing ')' while parsing

mag(arg()

--> FOAM Warning :
    Reading "/home/matej/PROJECTS/release2006/cavity/0/U" at line 35
    Imbalanced '{' with ')'
--> FOAM Warning :
    From virtual Foam::Istream& Foam::ISstream::read(Foam::word&)
    in file db/IOstreams/Sstreams/ISstream.C at line 482
    Reading "/home/matej/PROJECTS/release2006/cavity/0/U" at line 35
    Missing 1 closing ')' while parsing

vector(1,