Weird codegen bug

[RazvanN]

import std.stdio : writeln;

void main()
{
     int a = 7;
     int b = 9;

     /* some code later */

     *(&a + 1) = 2;
     writeln(b);
     writeln(b);
}

This code prints:

9
2

with latest version of dmd. Is this a bug or am I missing 
something? For the record,
gdc prints (as expected):

2
2