Exception is thrown if method with an interpolated string handler argument on a mocked interface is called

[appel1]

Describe the bug If a mocked interface has a method with an interpolated string handler an exception is thrown if the method is called.

To Reproduce

using System.Runtime.CompilerServices;

var foo = NSubstitute.Substitute.For<IFoo>();

foo.Foo($"{foo.GetType()}");

public interface IFoo
{
    void Foo(DefaultInterpolatedStringHandler handler);
}

System.InvalidProgramException
  HResult=0x8013153A
  Message=Common Language Runtime detected an invalid program.
  Source=DynamicProxyGenAssembly2
  StackTrace:
   at Castle.Proxies.ObjectProxy.Foo(DefaultInterpolatedStringHandler handler)
   at Program.<Main>$(String[] args) in Program.cs:line 6

Expected behaviour No exception

Environment:

• NSubstitute version: 5.0
• Platform: .NET 7.0

[GeraldLx]

NSubstitute relies on Castle.Core for proxy generation.

It seems Castle.Core does not work with ref struct types. So there is not much NSubstitute can do about this.

[appel1]

Possibly related issue https://github.com/castleproject/Core/issues/651