What is the state of scope function parameter?

[Ali Çehreli via Digitalmars-d-learn]

(More correctly, "scope storage class".)

  https://dlang.org/spec/function.html#Parameter
still says

  scope: references in the parameter cannot be escaped
         (e.g. assigned to a global variable). Ignored for
         parameters with no references

However, it doesn't behave that way. For example, my example here 
currently is a lie because there is no compilation error with 2.073.2:


http://ddili.org/ders/d.en/function_parameters.html#ix_function_parameters.scope

What's the truth? How would you change the text there?

Thank you,
Ali