... and another...
struct S(T, int N)
{ public auto opBinary(string op)(in S!(T, N) other) const { return
this; } }
void main() { S!(int, 1) m; m = m * m; }
Error: 'm' is not of arithmetic type, it is a Matrix!(int,1)
Error: 'm' is not of arithmetic type, it is a Matrix!(int,1)