Changed meaning of .+= in Julia 0.5

[stevengj]

Your test code uses x .+= y, so you should know that in Julia 0.5 this has changed meaning to be equivalent to broadcast!(identity, x, x .+ y), so that it mutates the x array (see JuliaLang/julia#17510 … in Julia 0.6 the whole operation will occur in-place without temporaries). So .+ should only be used if the left-hand side is a mutable array, and you don't mind mutating it.

At first glance, this looks like it is okay for you, because you use it in counts .+= 1, where counts seems like an array that you won't mind mutating. But if it were a problem you could always change it to +=.

[timholy]

Not relevant anymore