How does array assignment for different sized types work?

[Timon Gehr]

On 01/31/2013 05:48 AM, estew wrote:
> void main() {
>       float[3] v1 = [1.0, 2.0, 3.0];    // No error
>       float[3] v = [1.0, 2.0, 3.0].dup; // Fails at runtime with error message
> }
> ...

It fails at compile time?

The reason is that array literals have special conversion rules:

Eg:

bool[] x = [0,1,0,1,0,1,1];

An array literal is converted element-wise. This means an array literal 
sometimes behaves differently from other expressions of the same type:

import std.stdio;

void main() {
	int[] a = [0,2,0,1];
	bool[] x = cast(bool[])[0,2,0,1];
	bool[] y = cast(bool[])a;
	writeln(x,"\n",y);
}

[false, true, false, true]
[false, false, false, false, true, false, false, false, false, false, 
false, false, true, false, false, false]