It would be very convenient to add a Scope support into Interpreter. Consider the following snippet:

record Person(string Name, string Gender, int Age);

var interpreter = new Interpreter();

// this is a proposed Scope feature
interpreter.UseScope<Person>();

var person = new Person("Ulrich", "Male", 30);

var lambda = interpreter.Parse("Gender == \"Male\" && Age >= 30"); 

Assert.True(lambda.Invoke(person));

So it looks like a this reference that is implicitly passed when calling class methods.

Although I can pass a person object itself as a variables - this will make the expression more complex i.e. "person.Gender == \"Male\" && person.Age >= 30" what is less convenient and not concise.