Rollup merge of rust-lang#40379 - clarcharr:box_docs, r=brson

Box docs: no allocation is done for ZSTs. Updated to add a small bit saying that ZSTs don't actually allocate on `Box::new`.
alexcrichton · Mar 10, 2017 · 9d8f75d · 9d8f75d
2 parents bb558d1 + edf5dc6
commit 9d8f75d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
@@ -225,6 +225,8 @@ impl<T: ?Sized> Drop for IntermediateBox<T> {
 impl<T> Box<T> {
     /// Allocates memory on the heap and then places `x` into it.
     ///
+    /// This doesn't actually allocate if `T` is zero-sized.
+    ///
     /// # Examples
     ///
     /// ```