return scope vs. scope return

[0xEAB]

Apparently there a difference between:

- ```d
   Message withBody(Body body_) return scope { /* … */ }
   ```
- ```d
   Message withBody(Body body_) scope return {  /* … */ }
   ```

> ```
> Deprecation: returning `this._body` escapes a reference to 
> parameter `this`
>        perhaps change the `return scope` into `scope return`
> ```

What is it?
And why (…does the order of attributes matter)?