Given this code

----
import std.algorithm.iteration : sum, cumulativeFold;
void main()
{
    double[5] a;
    auto asum = 1.23;
    auto jProbs = a[].cumulativeFold!((a, b) => (a + b)/asum);
}
----

The last line does not compile. 
See
https://forum.dlang.org/post/mplrntaplbtsoyxkwpqn@forum.dlang.org
probably related to 
https://issues.dlang.org/show_bug.cgi?id=11886 ? 

Used compiler: 
DMD64 D Compiler v2.076.0
on a Mac.