With DMD 2.048 this dotProduct doesn't work:

import std.numeric;
void main() {
    assert(dotProduct([1, 3, -5], [4, -2, -1]) == 3);
}



This is the first part of dotProduct:

Unqual!(CommonType!(F1, F2))
dotProduct(F1, F2)(in F1[] avector, in F2[] bvector)
{
    immutable n = avector.length;
    assert(n == bvector.length);
    auto avec = avector.ptr, bvec = bvector.ptr;
    typeof(return) sum0 = 0.0, sum1 = 0.0;


To fix it replace this:
typeof(return) sum0 = 0.0, sum1 = 0.0;

With:
typeof(return) sum0 = 0, sum1 = 0;