Allow ref struct on Generic ThrowHelper methods

[Avid29]

Overview

This would allow ref structs to be used in pattern matching with a ThrowHelper case, using the new allow ref struct "anti-constraint".

API breakdown

This changes nothing except allowable use cases for existing ThrowHelper APIs.

Usage example

This use case has nothing specific in mind, but the point is you can imagine pattern matching a ref struct such as Span<T>.

Span<int> span = x switch
{
    0 => stackalloc int[size],
    1 => new int[size],
    2 => something.AsSpan(),
    _ => ThrowHelper.ThrowArgumentOutOfRangeException<Span<int>>(),
};

Breaking change?

No

Alternatives

throw without ThrowHelper

Additional context

This will require .NET 9 and C# version 13

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