Unexplainable behaviour with direct struct assignment.

[HuskyNator]

I came across strange, seemingly non-deterministic, behaviour 
today. I simplified it the best I could below. I entice you to 
run the following piece of code.

```d
module app;
import std.stdio;

struct A {
	float[1] vec;
	this(float[1] n) {
		this.vec = n;
	}
}

void main(string[] args) {
	A c = A([50.0f]);
	writeln(c.vec[0]);

	A b = A([50.0f]);
	writeln(b.vec[0]);

	c = A([50.0f]);
	writeln(c.vec[0]);
}
```

This will print:
```
0
50
nan
```

My findings:
- The first initializer will always contain 0
- Initialization to another variable will yield the expected 50
- Reinitialization will always yield null

Am I missing something? Is this a bug? I have no idea what is 
wrong.
Thanks for you help,
- HN