Bug 5611 – back() and front() with ref return + opSlice() in sort() constraint

With some experiments I have seen that the input of std.algorithm.sort() has other requirements beside being just a random access range (dmd 2.052): http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D.learn&article_id=24795 My experiment shows that beside being a random access range, the input range needs also: - opSlice() - back() and front() must return their results by ref. So to reduce troubles for the users I suggest to add those three requirements inside the template constraint of sort(), to produce a better error message and detect problems more early.

Since this bug report was filed, the sorting algorithms were updated and the template restraints were updated to reflect these changes.