Why can't static arrays be sorted?

[TheGag96 via Digitalmars-d-learn]

I was writing some code today and ran into this oddity that I'd 
never come across before:

    import std.algorithm : sort;
    int[10] arr = [0, 3, 4, 6, 2, 1, 1, 4, 6, 9];
    thing.sort();
This doesn't compile. Obviously the .sort property works, but 
what about static arrays makes them unable to be sorted by 
std.algorithm.sort? Thanks.