[Bug]: Mocking of interfaces using parameters called @event fails #5083

Description

When trying to mock an interface with Mock.Of<Interface> and any method contains @event as a parameter name, the mocking fails. The problem probably also appears when using other keywords that are escaped with @

Expected Behavior

Successful compilation

Actual Behavior

Compiler Errors

Steps to Reproduce

Try to mock this interface:

public interface ITest
{
    void Test(string @event);
}

TUnit Version

1.18.21-beta

.NET Version

.NET 10.0

Operating System

Windows

IDE / Test Runner

JetBrains Rider

Error Output / Stack Trace

Additional Context

No response

IDE-Specific Issue?

• I've confirmed this issue occurs when running via dotnet test or dotnet run, not just in my IDE