Smart compiler is smart

decompile_asdf.java

//eclipse compiled and jd-gui decompiled
public class asdf
{
  public static final int x = 10;
  public int z = 3;

  public asdf() {
    int y = 11; //YES!!!
    this.z += y;
  }
}

orig_asdf.java

//original
public class asdf
{
    public static final int x = 10;
    public int z=3;
    public asdf()
    {
        int y = x+1;
        z+=y;
    }
}