Re: built-in int[] opSliceOpAssign throws?

[Namespace]

You are right, slice isn't nothrow, this should may be fixed.
But if you don't assign your dynamic array first, you have a 
problem: you cannot put elements in a empty dynamic array with 
arr[i] = val;, you have to use arr ~= val;

This code works:

import std.stdio;

nothrow void foo1(ref int[] a)
{
    foreach(i; 0..10)
    {
        a ~= 5;
        a[i] += 5;
    }
}

void foo2(ref int[] a) //10
{
    a[]  = 5;  //12, no explicit slice, so the whole array is 
assigned with 5
    a[] += 7;  //13
}

void main() {
        int[] a;
        
        foo1(a);
        foo2(a);
        
        writeln(a);
}