public void ReadOnlyArraysBroken()
{
var b = new ArrayBuilder <String>();
b.Add("hello");
b.Add("world");
Assert.Equal("hello", b[0]);
var a = b.AsImmutable();
Assert.Equal("hello", a[0]);
var e = (IEnumerable <string>)a;
Assert.Equal("hello", e.First());
var aa = e.ToArray();
Assert.Equal("hello", aa[0]);
var first = b.FirstOrDefault((x) => true);
Assert.Equal("hello", first);
ImmutableArray <int> nullOrEmpty = default(ImmutableArray <int>);
Assert.True(nullOrEmpty.IsDefault);
Assert.True(nullOrEmpty.IsDefaultOrEmpty);
Assert.Throws <NullReferenceException>(() => nullOrEmpty.IsEmpty);
nullOrEmpty = ImmutableArray.Create <int>();
Assert.True(nullOrEmpty.IsEmpty);
}
