bors 580298680c Auto merge of #45819 - Havvy:cell, r=aturon
Add RefCell<T>::replace_with

I also moved the `Panic` sections to before examples in the other two functions also under this feature gate, and changed the variable names in `replace` to be more readable.

r? @rust-libs
2017-11-20 05:58:23 +00:00
..
2017-11-16 13:34:13 -05:00