The ^ operator introduced with Ranges ^{C# 8.0} could not be used in object initializers. C# 13.0 allows the ^ operator to be used in object initializers.

Code

Now

var greeter = new Greeter { Message = { [^1] = '!' }};

class Greeter
{
    public char[] Message { get; set; } = "Hello?".ToCharArray();
}

Before

var greeter = new Greeter();
greeter.Message[^1] = '!';

class Greeter
{
    public char[] Message { get; set; } = "Hello?".ToCharArray();
}

More information

• What's new in C# 13.0