Merge branch '0.4' of https://github.com/bluss/arrayvec into merge-0.4

* '0.4' of https://github.com/bluss/arrayvec:
  0.4.9
  TEST: Add test that ensures the MaybeUninit impl is used on nightly
  FIX: Remove use of uninitialized in ArrayString
  FEAT: Implement a "MaybeUninit" and use it conditionally
  TEST: Add test that Some(ArrayVec<[&_;_]>).is_some()
  MAINT: Test the 0.4 branch in travis

src/array_string.rs

@@ -2,6 +2,7 @@ use std::borrow::Borrow;
 use std::cmp;
 use std::fmt;
 use std::hash::{Hash, Hasher};
+use std::mem;
 use std::ptr;
 use std::ops::{Deref, DerefMut};
 use std::str;
@@ -25,6 +26,7 @@ use serde::{Serialize, Deserialize, Serializer, Deserializer};
 /// if needed.
 #[derive(Copy)]
 pub struct ArrayString<A: Array<Item=u8>> {
+    // FIXME: Use Copyable union for xs when we can
     xs: A,
     len: A::Index,
 }
@@ -52,7 +54,8 @@ impl<A: Array<Item=u8>> ArrayString<A> {
     pub fn new() -> ArrayString<A> {
         unsafe {
             ArrayString {
-                xs: ::new_array(),
+                // FIXME: Use Copyable union for xs when we can
+                xs: mem::zeroed(),
                 len: Index::from(0),
             }
         }