Why is sort allocating in this case?

[Vladimir Panteleev via Digitalmars-d-learn]

On Friday, 18 September 2015 at 02:21:13 UTC, Jack Stouffer wrote:
> The docs explicitly say that SwapStrategy.unstable is 
> non-allocating, but this code (which is for finding the 
> statistical mode of a range) will fail to compile.

Perhaps related to this issue you filed?

https://issues.dlang.org/show_bug.cgi?id=15003

sort calls assumeSorted, so it's affected by the same problem.