✅ When is the single argument positional pattern ever used?

var a = new Type() is Type(var y);
class Type {
    public void Deconstruct(out int x) => x = 1;
}

var a = new Type() is Type(var y);
class Type {
    public void Deconstruct(out int x) => x = 1;
}

The

Type(var y)

Type(var y)

is what I'm looking for. There is no equivalent for deconstruction (

var (y) = new Type()

var (y) = new Type()

is invalid). Does there exist any .NET API that even makes use of this? Is it ever good design compared to property patterns??