import std.stdio;

void main()
    real[int] a;
    a[0] += 100;

results (independed of the used compiler) in


I was a little bit surprised, because a[0] += 100 should be the same as a[0] = a[0]+100, which leads to a range violation error. Furthermore, as we work with real, I'd expected the result to be NaN...

Is this a bug? I ask, because it would be quite convenient to use it the way it works now.

An alternative I found, would be to use object.update. But there I've to declare the 100 twice which results in code duplication:

a.update(0,()=>100.0L,(ref real v)=>v+100.0L);

Hence, my best solution needs two lines:

if (0 !in a) a[0] = 0;
a[0] += 100;

What's your oppinion on this?

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