Operations on all array elements => access to memory outside array

[fded]

I tested this code:

import std.stdio;
void main(){
        double[] a=[1,2];
        double[10] c;
        c[]=a[]+0.;
        writeln(c);
        double[] b=[1,2,3,4,5,6,7,8,9,10];
        double[10] d;
        double[] e=b[0..2];
        d[]=e[]+0.;     
        writeln(e);
        writeln(d);
        d[]=e[];        
}

with the following result:

[1, 2, 0, 1.28823e-231, 1.11255e-308, -1.43745e+306, 0, 
1.28823e-231, 1.56648e-307, 0]
[1, 2]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
object.Exception@src\rt\arraycat.d(31): lengths don't match for 
array copy
----------------
415330
4151BB
406DC4
406DFE
406A1F
41C425
----------------

Unless I have missed something, it seems that:

= tests the length of the array and implies an exception

BUT:

+ does not test the length, and it is thus possible to read 
information which are not allowed...


For information, I was testing how []+ were handling smaller 
array (e.g. Error? completed with nan? completed with 0.? cyclic 
computation?)