Opening sentence was confusing and something cannot be "one of the most unique" (it either is or is not unique).

…st unique" (it either is or is not unique).

…st unique" (it either is or is not unique).

add as 2nd example.

`move` work both in `cmd` and in Powershell. `mv` works only in Powershell and the book says nothing about which shell is recommended so this could confuse beginners.

Closes rust-lang#33219.

make the borrowing example more concrete

…r=steveklabnik

Improve as_mut ptr method example

r? @steveklabnik

Tweaks to sections related to Ownership

Reading through these sections, I thought the intro text could be improved slightly.  So
here is a PR that addresses what was bugging me about it. :-)

Main issue was the wording of the opening sentence ("guide" is not clearly defined and the
wording was a bit too terse in my opinion).  I also took issue with the term "one of the most
unique".  Uniqueness is a `bool`, not an `f64`. :-)

r? @steveklabnik

Make HashSet::Insert documentation more consistent

I have made the HashSet::Insert documentation more consistent in the use of the term 'value' vs 'key'. Also clarified that if _this_ value is present true is returned, instead of the ambiguous 'a value present'.

r? @steveklabnik

…nikomatsakis

Improve error message about regions of function body

"scope of parameters for functions" is harder for me to read than "scope of function body", I hope others feel the same, as in <https://play.rust-lang.org/?gist=b4df68b395b807698bd2ba98cf3d5ce3&version=stable&backtrace=0&run=1>
 Thank @Aatch for the help :)

…sakis

allow InternedString to be compared to &str directly

…ch-1, r=GuillaumeGomez

Fix use of the `move` command in the Windows shell

`move` works both in `cmd` and in Powershell. `mv` works only in Powershell and the book says nothing about which shell is recommended so this could confuse beginners.

Closes rust-lang#33219.

mir: drop temps outside-in by scheduling the drops inside-out.

It was backwards all along, but only noticeable with multiple drops in one rvalue scope. Fixes rust-lang#32433.