Borrowing -> Freezing example works in 2018 edition but text says it shouldn't compile

[phansch]

Seen on Discord.

In the freezing example, it says that the example should not compile. And it doesn't with the 2015 edition. However, when it's executed with the 2018 edition, it compiles. Probably because of NLL? Since the 2018 edition is the default for new projects, I think the example needs to be updated.

Playground with Rust 2018
Playground with Rust 2015

[chandu0101]

also this : alias

[yous]

Now it compiles with the 2015 edition, too.

[yous]

Accesing _large_integer after modifying _mutable_integer gives me an error on the both 2015 and 2018 edition, so the example can be updated to do so.

[rusty-snake]

Fixed by #1226?