static unsafe void F()
{
Console.WriteLine(new String("abc"));
fixed (char* c = "abc")
{
    c[0] = 'd';
    c[1] = 'e';
    c[2] = 'f';
}
Console.WriteLine("abc");
}
F();

static unsafe void F()
{
Console.WriteLine(new String("abc"));
fixed (char* c = "abc")
{
    c[0] = 'd';
    c[1] = 'e';
    c[2] = 'f';
}
Console.WriteLine("abc");
}
F();