Chapter 3 , claryifying that a mutable variable can be shadowed.

[low-perry]

On chapter 3 , shadowing section the text goes to great lengths to explain the difference between mutability and shadowing, somewhat implying that you can have either/or (not stated anywhere).
I think it would be a good idea to add a note clarifying that you can also shadow a mutable variable and maybe encourage the reader to try it for themselves.

NOTE: It is possible to shadow a mutable variable.

[chriskrycho]

Thanks for the suggestion. I can see how you might have drawn that conclusion, but I don’t think the text does imply that; it simply distinguishes the behavior mutating an existing binding and creating a new one by shadowing. Also, the book is not a reference, but an introduction, so we don’t try to cover every single point we could this way—the physical copy is already pretty huge! Thanks, though.