Merge pull request rust-unofficial#33 from partim/take-for-replace

Mention Option::take() as an alternative to mem::replace()

idioms/mem-replace.md

@@ -56,6 +56,11 @@ this case, we put in an empty `String`, which does not need to allocate. As a
 result, we get the original `name` *as an owned value*. We can then wrap this in
 another enum.
 
+Note, however, that if we are using an `Option` and want to replace its
+value with a `None`, `Option`’s `take()` method provides a shorter and
+more idiomatic alternative.
+
+
 ## Advantages
 
 Look ma, no allocation! Also you may feel like Indiana Jones while doing it.
@@ -78,6 +83,7 @@ However, in Rust, we have to do a little more work to do this. An owned value
 may only have one owner, so to take it out, we need to put something back in –
 like Indiana Jones, replacing the artifact with a bag of sand.
 
+
 ## See also
 
 This gets rid of the [Clone to satisfy the borrow checker] antipattern in a