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-rw-r--r--src/liballoc/boxed.rs16
-rw-r--r--src/libcollections/btree/map.rs22
-rw-r--r--src/libcollections/btree/node.rs4
-rw-r--r--src/libcollections/btree/set.rs4
-rw-r--r--src/libcollections/slice.rs2
-rw-r--r--src/libcore/borrow.rs38
-rw-r--r--src/libcore/clone.rs2
-rw-r--r--src/libcore/cmp.rs24
-rw-r--r--src/libcore/fmt/mod.rs8
-rw-r--r--src/libcore/hash/mod.rs8
-rw-r--r--src/libcore/hash/sip.rs6
-rw-r--r--src/libcore/kinds.rs18
-rw-r--r--src/libcore/mem.rs4
-rw-r--r--src/libcore/ops.rs24
-rw-r--r--src/libcore/slice.rs4
-rw-r--r--src/libcore/str/mod.rs2
-rw-r--r--src/libcoretest/hash/mod.rs2
-rw-r--r--src/libgraphviz/maybe_owned_vec.rs2
-rw-r--r--src/librustc/middle/intrinsicck.rs8
-rw-r--r--src/librustc/util/nodemap.rs2
-rw-r--r--src/librustc/util/ppaux.rs2
-rw-r--r--src/libserialize/serialize.rs4
-rw-r--r--src/libserialize/serialize_stage0.rs4
-rw-r--r--src/libstd/collections/hash/map.rs30
-rw-r--r--src/libstd/collections/hash/set.rs4
-rw-r--r--src/libstd/collections/hash/table.rs2
-rw-r--r--src/libstd/hash.rs2
-rw-r--r--src/libstd/io/mod.rs8
-rw-r--r--src/libstd/path/mod.rs2
-rw-r--r--src/libstd/path/posix.rs2
-rw-r--r--src/libsyntax/parse/obsolete.rs57
-rw-r--r--src/libsyntax/parse/parser.rs31
-rw-r--r--src/libsyntax/util/interner.rs4
-rw-r--r--src/test/compile-fail/associated-types-unsized.rs2
-rw-r--r--src/test/compile-fail/dst-bad-assign-2.rs2
-rw-r--r--src/test/compile-fail/dst-bad-assign.rs2
-rw-r--r--src/test/compile-fail/dst-bad-coerce1.rs2
-rw-r--r--src/test/compile-fail/dst-bad-coerce2.rs2
-rw-r--r--src/test/compile-fail/dst-bad-coerce3.rs2
-rw-r--r--src/test/compile-fail/dst-bad-coerce4.rs2
-rw-r--r--src/test/compile-fail/dst-bad-coercions.rs2
-rw-r--r--src/test/compile-fail/dst-bad-deep.rs2
-rw-r--r--src/test/compile-fail/dst-object-from-unsized-type.rs4
-rw-r--r--src/test/compile-fail/transmute-fat-pointers.rs8
-rw-r--r--src/test/compile-fail/transmute-impl.rs4
-rw-r--r--src/test/compile-fail/unboxed-closure-sugar-default.rs6
-rw-r--r--src/test/compile-fail/unboxed-closure-sugar-equiv.rs6
-rw-r--r--src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs6
-rw-r--r--src/test/compile-fail/unboxed-closure-sugar-region.rs6
-rw-r--r--src/test/compile-fail/unsized-bare-typaram.rs2
-rw-r--r--src/test/compile-fail/unsized-enum.rs10
-rw-r--r--src/test/compile-fail/unsized-inherent-impl-self-type.rs2
-rw-r--r--src/test/compile-fail/unsized-struct.rs10
-rw-r--r--src/test/compile-fail/unsized-trait-impl-self-type.rs4
-rw-r--r--src/test/compile-fail/unsized-trait-impl-trait-arg.rs4
-rw-r--r--src/test/compile-fail/unsized3.rs20
-rw-r--r--src/test/compile-fail/unsized4.rs2
-rw-r--r--src/test/compile-fail/unsized5.rs8
-rw-r--r--src/test/compile-fail/unsized6.rs12
-rw-r--r--src/test/compile-fail/unsized7.rs4
-rw-r--r--src/test/run-pass-valgrind/dst-dtor-1.rs2
-rw-r--r--src/test/run-pass-valgrind/dst-dtor-2.rs2
-rw-r--r--src/test/run-pass/associated-types-conditional-dispatch.rs2
-rw-r--r--src/test/run-pass/issue-18906.rs2
64 files changed, 251 insertions, 245 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index 33d1cc7f4c7..6df8bb5f7aa 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -75,14 +75,14 @@ impl<T: Clone> Clone for Box<T> {
 }
 
 #[stable]
-impl<Sized? T: PartialEq> PartialEq for Box<T> {
+impl<T: ?Sized + PartialEq> PartialEq for Box<T> {
     #[inline]
     fn eq(&self, other: &Box<T>) -> bool { PartialEq::eq(&**self, &**other) }
     #[inline]
     fn ne(&self, other: &Box<T>) -> bool { PartialEq::ne(&**self, &**other) }
 }
 #[stable]
-impl<Sized? T: PartialOrd> PartialOrd for Box<T> {
+impl<T: ?Sized + PartialOrd> PartialOrd for Box<T> {
     #[inline]
     fn partial_cmp(&self, other: &Box<T>) -> Option<Ordering> {
         PartialOrd::partial_cmp(&**self, &**other)
@@ -97,16 +97,16 @@ impl<Sized? T: PartialOrd> PartialOrd for Box<T> {
     fn gt(&self, other: &Box<T>) -> bool { PartialOrd::gt(&**self, &**other) }
 }
 #[stable]
-impl<Sized? T: Ord> Ord for Box<T> {
+impl<T: ?Sized + Ord> Ord for Box<T> {
     #[inline]
     fn cmp(&self, other: &Box<T>) -> Ordering {
         Ord::cmp(&**self, &**other)
     }
 
 #[stable]}
-impl<Sized? T: Eq> Eq for Box<T> {}
+impl<T: ?Sized + Eq> Eq for Box<T> {}
 
-impl<S: hash::Writer, Sized? T: Hash<S>> Hash<S> for Box<T> {
+impl<S: hash::Writer, T: ?Sized + Hash<S>> Hash<S> for Box<T> {
     #[inline]
     fn hash(&self, state: &mut S) {
         (**self).hash(state);
@@ -143,7 +143,7 @@ impl BoxAny for Box<Any> {
     }
 }
 
-impl<Sized? T: fmt::Show> fmt::Show for Box<T> {
+impl<T: ?Sized + fmt::Show> fmt::Show for Box<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         (**self).fmt(f)
     }
@@ -156,14 +156,14 @@ impl fmt::Show for Box<Any> {
 }
 
 #[stable]
-impl<Sized? T> Deref for Box<T> {
+impl<T: ?Sized> Deref for Box<T> {
     type Target = T;
 
     fn deref(&self) -> &T { &**self }
 }
 
 #[stable]
-impl<Sized? T> DerefMut for Box<T> {
+impl<T: ?Sized> DerefMut for Box<T> {
     fn deref_mut(&mut self) -> &mut T { &mut **self }
 }
 
diff --git a/src/libcollections/btree/map.rs b/src/libcollections/btree/map.rs
index ea504530c4b..b85ea65f5ce 100644
--- a/src/libcollections/btree/map.rs
+++ b/src/libcollections/btree/map.rs
@@ -130,7 +130,7 @@ pub struct Values<'a, K: 'a, V: 'a> {
 
 #[stable]
 /// A view into a single entry in a map, which may either be vacant or occupied.
-pub enum Entry<'a, Sized? Q:'a, K:'a, V:'a> {
+pub enum Entry<'a, Q: ?Sized +'a, K:'a, V:'a> {
     /// A vacant Entry
     Vacant(VacantEntry<'a, Q, K, V>),
     /// An occupied Entry
@@ -139,7 +139,7 @@ pub enum Entry<'a, Sized? Q:'a, K:'a, V:'a> {
 
 #[stable]
 /// A vacant Entry.
-pub struct VacantEntry<'a, Sized? Q:'a, K:'a, V:'a> {
+pub struct VacantEntry<'a, Q: ?Sized +'a, K:'a, V:'a> {
     key: &'a Q,
     stack: stack::SearchStack<'a, K, V, node::handle::Edge, node::handle::Leaf>,
 }
@@ -214,7 +214,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// assert_eq!(map.get(&2), None);
     /// ```
     #[stable]
-    pub fn get<Sized? Q>(&self, key: &Q) -> Option<&V> where Q: BorrowFrom<K> + Ord {
+    pub fn get<Q: ?Sized>(&self, key: &Q) -> Option<&V> where Q: BorrowFrom<K> + Ord {
         let mut cur_node = &self.root;
         loop {
             match Node::search(cur_node, key) {
@@ -246,7 +246,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// assert_eq!(map.contains_key(&2), false);
     /// ```
     #[stable]
-    pub fn contains_key<Sized? Q>(&self, key: &Q) -> bool where Q: BorrowFrom<K> + Ord {
+    pub fn contains_key<Q: ?Sized>(&self, key: &Q) -> bool where Q: BorrowFrom<K> + Ord {
         self.get(key).is_some()
     }
 
@@ -270,7 +270,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// ```
     // See `get` for implementation notes, this is basically a copy-paste with mut's added
     #[stable]
-    pub fn get_mut<Sized? Q>(&mut self, key: &Q) -> Option<&mut V> where Q: BorrowFrom<K> + Ord {
+    pub fn get_mut<Q: ?Sized>(&mut self, key: &Q) -> Option<&mut V> where Q: BorrowFrom<K> + Ord {
         // temp_node is a Borrowck hack for having a mutable value outlive a loop iteration
         let mut temp_node = &mut self.root;
         loop {
@@ -440,7 +440,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// assert_eq!(map.remove(&1), None);
     /// ```
     #[stable]
-    pub fn remove<Sized? Q>(&mut self, key: &Q) -> Option<V> where Q: BorrowFrom<K> + Ord {
+    pub fn remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V> where Q: BorrowFrom<K> + Ord {
         // See `swap` for a more thorough description of the stuff going on in here
         let mut stack = stack::PartialSearchStack::new(self);
         loop {
@@ -878,7 +878,7 @@ impl<K: Show, V: Show> Show for BTreeMap<K, V> {
 }
 
 #[stable]
-impl<K: Ord, Sized? Q, V> Index<Q> for BTreeMap<K, V>
+impl<K: Ord, Q: ?Sized, V> Index<Q> for BTreeMap<K, V>
     where Q: BorrowFrom<K> + Ord
 {
     type Output = V;
@@ -889,7 +889,7 @@ impl<K: Ord, Sized? Q, V> Index<Q> for BTreeMap<K, V>
 }
 
 #[stable]
-impl<K: Ord, Sized? Q, V> IndexMut<Q> for BTreeMap<K, V>
+impl<K: Ord, Q: ?Sized, V> IndexMut<Q> for BTreeMap<K, V>
     where Q: BorrowFrom<K> + Ord
 {
     type Output = V;
@@ -1111,7 +1111,7 @@ impl<'a, K, V> DoubleEndedIterator for Values<'a, K, V> {
 #[stable]
 impl<'a, K, V> ExactSizeIterator for Values<'a, K, V> {}
 
-impl<'a, Sized? Q, K: Ord, V> Entry<'a, Q, K, V> {
+impl<'a, Q: ?Sized, K: Ord, V> Entry<'a, Q, K, V> {
     #[unstable = "matches collection reform v2 specification, waiting for dust to settle"]
     /// Returns a mutable reference to the entry if occupied, or the VacantEntry if vacant
     pub fn get(self) -> Result<&'a mut V, VacantEntry<'a, Q, K, V>> {
@@ -1122,7 +1122,7 @@ impl<'a, Sized? Q, K: Ord, V> Entry<'a, Q, K, V> {
     }
 }
 
-impl<'a, Sized? Q: ToOwned<K>, K: Ord, V> VacantEntry<'a, Q, K, V> {
+impl<'a, Q: ?Sized + ToOwned<K>, K: Ord, V> VacantEntry<'a, Q, K, V> {
     #[stable]
     /// Sets the value of the entry with the VacantEntry's key,
     /// and returns a mutable reference to it.
@@ -1362,7 +1362,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// ```
     /// The key must have the same ordering before or after `.to_owned()` is called.
     #[stable]
-    pub fn entry<'a, Sized? Q>(&'a mut self, mut key: &'a Q) -> Entry<'a, Q, K, V>
+    pub fn entry<'a, Q: ?Sized>(&'a mut self, mut key: &'a Q) -> Entry<'a, Q, K, V>
         where Q: Ord + ToOwned<K>
     {
         // same basic logic of `swap` and `pop`, blended together
diff --git a/src/libcollections/btree/node.rs b/src/libcollections/btree/node.rs
index 1f719da590b..0a93bbf89c9 100644
--- a/src/libcollections/btree/node.rs
+++ b/src/libcollections/btree/node.rs
@@ -517,7 +517,7 @@ impl<K: Ord, V> Node<K, V> {
     /// Searches for the given key in the node. If it finds an exact match,
     /// `Found` will be yielded with the matching index. If it doesn't find an exact match,
     /// `GoDown` will be yielded with the index of the subtree the key must lie in.
-    pub fn search<Sized? Q, NodeRef: Deref<Target=Node<K, V>>>(node: NodeRef, key: &Q)
+    pub fn search<Q: ?Sized, NodeRef: Deref<Target=Node<K, V>>>(node: NodeRef, key: &Q)
                   -> SearchResult<NodeRef> where Q: BorrowFrom<K> + Ord {
         // FIXME(Gankro): Tune when to search linear or binary based on B (and maybe K/V).
         // For the B configured as of this writing (B = 6), binary search was *significantly*
@@ -536,7 +536,7 @@ impl<K: Ord, V> Node<K, V> {
         }
     }
 
-    fn search_linear<Sized? Q>(&self, key: &Q) -> (bool, uint) where Q: BorrowFrom<K> + Ord {
+    fn search_linear<Q: ?Sized>(&self, key: &Q) -> (bool, uint) where Q: BorrowFrom<K> + Ord {
         for (i, k) in self.keys().iter().enumerate() {
             match key.cmp(BorrowFrom::borrow_from(k)) {
                 Greater => {},
diff --git a/src/libcollections/btree/set.rs b/src/libcollections/btree/set.rs
index 80d01c07547..82cef9b3549 100644
--- a/src/libcollections/btree/set.rs
+++ b/src/libcollections/btree/set.rs
@@ -299,7 +299,7 @@ impl<T: Ord> BTreeSet<T> {
     /// assert_eq!(set.contains(&4), false);
     /// ```
     #[stable]
-    pub fn contains<Sized? Q>(&self, value: &Q) -> bool where Q: BorrowFrom<T> + Ord {
+    pub fn contains<Q: ?Sized>(&self, value: &Q) -> bool where Q: BorrowFrom<T> + Ord {
         self.map.contains_key(value)
     }
 
@@ -429,7 +429,7 @@ impl<T: Ord> BTreeSet<T> {
     /// assert_eq!(set.remove(&2), false);
     /// ```
     #[stable]
-    pub fn remove<Sized? Q>(&mut self, value: &Q) -> bool where Q: BorrowFrom<T> + Ord {
+    pub fn remove<Q: ?Sized>(&mut self, value: &Q) -> bool where Q: BorrowFrom<T> + Ord {
         self.map.remove(value).is_some()
     }
 }
diff --git a/src/libcollections/slice.rs b/src/libcollections/slice.rs
index d41ca2e2149..f286b99e045 100644
--- a/src/libcollections/slice.rs
+++ b/src/libcollections/slice.rs
@@ -1008,7 +1008,7 @@ impl<T: Ord> OrdSliceExt<T> for [T] {
 
 #[unstable = "U should be an associated type"]
 /// An extension trait for concatenating slices
-pub trait SliceConcatExt<Sized? T, U> {
+pub trait SliceConcatExt<T: ?Sized, U> {
     /// Flattens a slice of `T` into a single value `U`.
     #[stable]
     fn concat(&self) -> U;
diff --git a/src/libcore/borrow.rs b/src/libcore/borrow.rs
index d03a5877dc1..2c08b976355 100644
--- a/src/libcore/borrow.rs
+++ b/src/libcore/borrow.rs
@@ -54,39 +54,39 @@ use self::Cow::*;
 
 /// A trait for borrowing data.
 #[old_orphan_check]
-pub trait BorrowFrom<Sized? Owned> {
+pub trait BorrowFrom<Owned: ?Sized> {
     /// Immutably borrow from an owned value.
     fn borrow_from(owned: &Owned) -> &Self;
 }
 
 /// A trait for mutably borrowing data.
 #[old_orphan_check]
-pub trait BorrowFromMut<Sized? Owned> : BorrowFrom<Owned> {
+pub trait BorrowFromMut<Owned: ?Sized> : BorrowFrom<Owned> {
     /// Mutably borrow from an owned value.
     fn borrow_from_mut(owned: &mut Owned) -> &mut Self;
 }
 
-impl<Sized? T> BorrowFrom<T> for T {
+impl<T: ?Sized> BorrowFrom<T> for T {
     fn borrow_from(owned: &T) -> &T { owned }
 }
 
-impl<Sized? T> BorrowFromMut<T> for T {
+impl<T: ?Sized> BorrowFromMut<T> for T {
     fn borrow_from_mut(owned: &mut T) -> &mut T { owned }
 }
 
-impl<'a, Sized? T> BorrowFrom<&'a T> for T {
+impl<'a, T: ?Sized> BorrowFrom<&'a T> for T {
     fn borrow_from<'b>(owned: &'b &'a T) -> &'b T { &**owned }
 }
 
-impl<'a, Sized? T> BorrowFrom<&'a mut T> for T {
+impl<'a, T: ?Sized> BorrowFrom<&'a mut T> for T {
     fn borrow_from<'b>(owned: &'b &'a mut T) -> &'b T { &**owned }
 }
 
-impl<'a, Sized? T> BorrowFromMut<&'a mut T> for T {
+impl<'a, T: ?Sized> BorrowFromMut<&'a mut T> for T {
     fn borrow_from_mut<'b>(owned: &'b mut &'a mut T) -> &'b mut T { &mut **owned }
 }
 
-impl<'a, T, Sized? B> BorrowFrom<Cow<'a, T, B>> for B where B: ToOwned<T> {
+impl<'a, T, B: ?Sized> BorrowFrom<Cow<'a, T, B>> for B where B: ToOwned<T> {
     fn borrow_from<'b>(owned: &'b Cow<'a, T, B>) -> &'b B {
         &**owned
     }
@@ -94,12 +94,12 @@ impl<'a, T, Sized? B> BorrowFrom<Cow<'a, T, B>> for B where B: ToOwned<T> {
 
 /// Trait for moving into a `Cow`
 #[old_orphan_check]
-pub trait IntoCow<'a, T, Sized? B> {
+pub trait IntoCow<'a, T, B: ?Sized> {
     /// Moves `self` into `Cow`
     fn into_cow(self) -> Cow<'a, T, B>;
 }
 
-impl<'a, T, Sized? B> IntoCow<'a, T, B> for Cow<'a, T, B> where B: ToOwned<T> {
+impl<'a, T, B: ?Sized> IntoCow<'a, T, B> for Cow<'a, T, B> where B: ToOwned<T> {
     fn into_cow(self) -> Cow<'a, T, B> {
         self
     }
@@ -133,7 +133,7 @@ impl<T> ToOwned<T> for T where T: Clone {
 ///     }
 /// }
 /// ```
-pub enum Cow<'a, T, Sized? B: 'a> where B: ToOwned<T> {
+pub enum Cow<'a, T, B: ?Sized + 'a> where B: ToOwned<T> {
     /// Borrowed data.
     Borrowed(&'a B),
 
@@ -142,7 +142,7 @@ pub enum Cow<'a, T, Sized? B: 'a> where B: ToOwned<T> {
 }
 
 #[stable]
-impl<'a, T, Sized? B> Clone for Cow<'a, T, B> where B: ToOwned<T> {
+impl<'a, T, B: ?Sized> Clone for Cow<'a, T, B> where B: ToOwned<T> {
     fn clone(&self) -> Cow<'a, T, B> {
         match *self {
             Borrowed(b) => Borrowed(b),
@@ -154,7 +154,7 @@ impl<'a, T, Sized? B> Clone for Cow<'a, T, B> where B: ToOwned<T> {
     }
 }
 
-impl<'a, T, Sized? B> Cow<'a, T, B> where B: ToOwned<T> {
+impl<'a, T, B: ?Sized> Cow<'a, T, B> where B: ToOwned<T> {
     /// Acquire a mutable reference to the owned form of the data.
     ///
     /// Copies the data if it is not already owned.
@@ -196,7 +196,7 @@ impl<'a, T, Sized? B> Cow<'a, T, B> where B: ToOwned<T> {
 }
 
 #[stable]
-impl<'a, T, Sized? B> Deref for Cow<'a, T, B> where B: ToOwned<T>  {
+impl<'a, T, B: ?Sized> Deref for Cow<'a, T, B> where B: ToOwned<T>  {
     type Target = B;
 
     fn deref(&self) -> &B {
@@ -208,10 +208,10 @@ impl<'a, T, Sized? B> Deref for Cow<'a, T, B> where B: ToOwned<T>  {
 }
 
 #[stable]
-impl<'a, T, Sized? B> Eq for Cow<'a, T, B> where B: Eq + ToOwned<T> {}
+impl<'a, T, B: ?Sized> Eq for Cow<'a, T, B> where B: Eq + ToOwned<T> {}
 
 #[stable]
-impl<'a, T, Sized? B> Ord for Cow<'a, T, B> where B: Ord + ToOwned<T> {
+impl<'a, T, B: ?Sized> Ord for Cow<'a, T, B> where B: Ord + ToOwned<T> {
     #[inline]
     fn cmp(&self, other: &Cow<'a, T, B>) -> Ordering {
         Ord::cmp(&**self, &**other)
@@ -219,7 +219,7 @@ impl<'a, T, Sized? B> Ord for Cow<'a, T, B> where B: Ord + ToOwned<T> {
 }
 
 #[stable]
-impl<'a, 'b, T, U, Sized? B, Sized? C> PartialEq<Cow<'b, U, C>> for Cow<'a, T, B> where
+impl<'a, 'b, T, U, B: ?Sized, C: ?Sized> PartialEq<Cow<'b, U, C>> for Cow<'a, T, B> where
     B: PartialEq<C> + ToOwned<T>,
     C: ToOwned<U>,
 {
@@ -230,14 +230,14 @@ impl<'a, 'b, T, U, Sized? B, Sized? C> PartialEq<Cow<'b, U, C>> for Cow<'a, T, B
 }
 
 #[stable]
-impl<'a, T, Sized? B> PartialOrd for Cow<'a, T, B> where B: PartialOrd + ToOwned<T> {
+impl<'a, T, B: ?Sized> PartialOrd for Cow<'a, T, B> where B: PartialOrd + ToOwned<T> {
     #[inline]
     fn partial_cmp(&self, other: &Cow<'a, T, B>) -> Option<Ordering> {
         PartialOrd::partial_cmp(&**self, &**other)
     }
 }
 
-impl<'a, T, Sized? B> fmt::Show for Cow<'a, T, B> where B: fmt::Show + ToOwned<T>, T: fmt::Show {
+impl<'a, T, B: ?Sized> fmt::Show for Cow<'a, T, B> where B: fmt::Show + ToOwned<T>, T: fmt::Show {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             Borrowed(ref b) => fmt::Show::fmt(b, f),
diff --git a/src/libcore/clone.rs b/src/libcore/clone.rs
index 159c2a505d5..17991659f97 100644
--- a/src/libcore/clone.rs
+++ b/src/libcore/clone.rs
@@ -43,7 +43,7 @@ pub trait Clone : Sized {
 }
 
 #[stable]
-impl<'a, Sized? T> Clone for &'a T {
+impl<'a, T: ?Sized> Clone for &'a T {
     /// Return a shallow copy of the reference.
     #[inline]
     fn clone(&self) -> &'a T { *self }
diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index b6d61b7704f..af5e98ed303 100644
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -70,7 +70,7 @@ use option::Option::{self, Some, None};
 #[lang="eq"]
 #[stable]
 #[old_orphan_check]
-pub trait PartialEq<Sized? Rhs = Self> {
+pub trait PartialEq<Rhs: ?Sized = Self> {
     /// This method tests for `self` and `other` values to be equal, and is used by `==`.
     #[stable]
     fn eq(&self, other: &Rhs) -> bool;
@@ -225,7 +225,7 @@ impl PartialOrd for Ordering {
 /// 5.11).
 #[lang="ord"]
 #[stable]
-pub trait PartialOrd<Sized? Rhs = Self>: PartialEq<Rhs> {
+pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     /// This method returns an ordering between `self` and `other` values
     /// if one exists.
     #[stable]
@@ -429,14 +429,14 @@ mod impls {
     // & pointers
 
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialEq<&'b B> for &'a A where A: PartialEq<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialEq<&'b B> for &'a A where A: PartialEq<B> {
         #[inline]
         fn eq(&self, other: & &'b B) -> bool { PartialEq::eq(*self, *other) }
         #[inline]
         fn ne(&self, other: & &'b B) -> bool { PartialEq::ne(*self, *other) }
     }
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialOrd<&'b B> for &'a A where A: PartialOrd<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialOrd<&'b B> for &'a A where A: PartialOrd<B> {
         #[inline]
         fn partial_cmp(&self, other: &&'b B) -> Option<Ordering> {
             PartialOrd::partial_cmp(*self, *other)
@@ -451,24 +451,24 @@ mod impls {
         fn gt(&self, other: & &'b B) -> bool { PartialOrd::gt(*self, *other) }
     }
     #[stable]
-    impl<'a, Sized? A> Ord for &'a A where A: Ord {
+    impl<'a, A: ?Sized> Ord for &'a A where A: Ord {
         #[inline]
         fn cmp(&self, other: & &'a A) -> Ordering { Ord::cmp(*self, *other) }
     }
     #[stable]
-    impl<'a, Sized? A> Eq for &'a A where A: Eq {}
+    impl<'a, A: ?Sized> Eq for &'a A where A: Eq {}
 
     // &mut pointers
 
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialEq<&'b mut B> for &'a mut A where A: PartialEq<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialEq<&'b mut B> for &'a mut A where A: PartialEq<B> {
         #[inline]
         fn eq(&self, other: &&'b mut B) -> bool { PartialEq::eq(*self, *other) }
         #[inline]
         fn ne(&self, other: &&'b mut B) -> bool { PartialEq::ne(*self, *other) }
     }
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialOrd<&'b mut B> for &'a mut A where A: PartialOrd<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialOrd<&'b mut B> for &'a mut A where A: PartialOrd<B> {
         #[inline]
         fn partial_cmp(&self, other: &&'b mut B) -> Option<Ordering> {
             PartialOrd::partial_cmp(*self, *other)
@@ -483,15 +483,15 @@ mod impls {
         fn gt(&self, other: &&'b mut B) -> bool { PartialOrd::gt(*self, *other) }
     }
     #[stable]
-    impl<'a, Sized? A> Ord for &'a mut A where A: Ord {
+    impl<'a, A: ?Sized> Ord for &'a mut A where A: Ord {
         #[inline]
         fn cmp(&self, other: &&'a mut A) -> Ordering { Ord::cmp(*self, *other) }
     }
     #[stable]
-    impl<'a, Sized? A> Eq for &'a mut A where A: Eq {}
+    impl<'a, A: ?Sized> Eq for &'a mut A where A: Eq {}
 
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialEq<&'b mut B> for &'a A where A: PartialEq<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialEq<&'b mut B> for &'a A where A: PartialEq<B> {
         #[inline]
         fn eq(&self, other: &&'b mut B) -> bool { PartialEq::eq(*self, *other) }
         #[inline]
@@ -499,7 +499,7 @@ mod impls {
     }
 
     #[stable]
-    impl<'a, 'b, Sized? A, Sized? B> PartialEq<&'b B> for &'a mut A where A: PartialEq<B> {
+    impl<'a, 'b, A: ?Sized, B: ?Sized> PartialEq<&'b B> for &'a mut A where A: PartialEq<B> {
         #[inline]
         fn eq(&self, other: &&'b B) -> bool { PartialEq::eq(*self, *other) }
         #[inline]
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index bde2fb75252..7d92b707f98 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -78,9 +78,9 @@ pub trait Writer {
         // This Adapter is needed to allow `self` (of type `&mut
         // Self`) to be cast to a FormatWriter (below) without
         // requiring a `Sized` bound.
-        struct Adapter<'a,Sized? T:'a>(&'a mut T);
+        struct Adapter<'a,T: ?Sized +'a>(&'a mut T);
 
-        impl<'a, Sized? T> Writer for Adapter<'a, T>
+        impl<'a, T: ?Sized> Writer for Adapter<'a, T>
             where T: Writer
         {
             fn write_str(&mut self, s: &str) -> Result {
@@ -592,10 +592,10 @@ pub fn argumentuint<'a>(s: &'a uint) -> Argument<'a> {
 
 // Implementations of the core formatting traits
 
-impl<'a, Sized? T: Show> Show for &'a T {
+impl<'a, T: ?Sized + Show> Show for &'a T {
     fn fmt(&self, f: &mut Formatter) -> Result { (**self).fmt(f) }
 }
-impl<'a, Sized? T: Show> Show for &'a mut T {
+impl<'a, T: ?Sized + Show> Show for &'a mut T {
     fn fmt(&self, f: &mut Formatter) -> Result { (**self).fmt(f) }
 }
 
diff --git a/src/libcore/hash/mod.rs b/src/libcore/hash/mod.rs
index d929e12a073..d8b9cf9594d 100644
--- a/src/libcore/hash/mod.rs
+++ b/src/libcore/hash/mod.rs
@@ -85,7 +85,7 @@ pub trait Hash<S = sip::SipState> {
 /// containers like `HashMap`, which need a generic way hash multiple types.
 pub trait Hasher<S> {
     /// Compute the hash of a value.
-    fn hash<Sized? T: Hash<S>>(&self, value: &T) -> u64;
+    fn hash<T: ?Sized + Hash<S>>(&self, value: &T) -> u64;
 }
 
 #[allow(missing_docs)]
@@ -194,14 +194,14 @@ impl<S: Writer, T: Hash<S>> Hash<S> for [T] {
 }
 
 
-impl<'a, S: Writer, Sized? T: Hash<S>> Hash<S> for &'a T {
+impl<'a, S: Writer, T: ?Sized + Hash<S>> Hash<S> for &'a T {
     #[inline]
     fn hash(&self, state: &mut S) {
         (**self).hash(state);
     }
 }
 
-impl<'a, S: Writer, Sized? T: Hash<S>> Hash<S> for &'a mut T {
+impl<'a, S: Writer, T: ?Sized + Hash<S>> Hash<S> for &'a mut T {
     #[inline]
     fn hash(&self, state: &mut S) {
         (**self).hash(state);
@@ -233,7 +233,7 @@ impl<S: Writer> Hash<S> for TypeId {
     }
 }
 
-impl<'a, T, Sized? B, S> Hash<S> for Cow<'a, T, B> where B: Hash<S> + ToOwned<T> {
+impl<'a, T, B: ?Sized, S> Hash<S> for Cow<'a, T, B> where B: Hash<S> + ToOwned<T> {
     #[inline]
     fn hash(&self, state: &mut S) {
         Hash::hash(&**self, state)
diff --git a/src/libcore/hash/sip.rs b/src/libcore/hash/sip.rs
index f9da0493f3e..c4d45e9c2c8 100644
--- a/src/libcore/hash/sip.rs
+++ b/src/libcore/hash/sip.rs
@@ -239,7 +239,7 @@ impl SipHasher {
 
 impl Hasher<SipState> for SipHasher {
     #[inline]
-    fn hash<Sized? T: Hash<SipState>>(&self, value: &T) -> u64 {
+    fn hash<T: ?Sized + Hash<SipState>>(&self, value: &T) -> u64 {
         let mut state = SipState::new_with_keys(self.k0, self.k1);
         value.hash(&mut state);
         state.result()
@@ -255,7 +255,7 @@ impl Default for SipHasher {
 
 /// Hashes a value using the SipHash algorithm.
 #[inline]
-pub fn hash<Sized? T: Hash<SipState>>(value: &T) -> u64 {
+pub fn hash<T: ?Sized + Hash<SipState>>(value: &T) -> u64 {
     let mut state = SipState::new();
     value.hash(&mut state);
     state.result()
@@ -263,7 +263,7 @@ pub fn hash<Sized? T: Hash<SipState>>(value: &T) -> u64 {
 
 /// Hashes a value with the SipHash algorithm with the provided keys.
 #[inline]
-pub fn hash_with_keys<Sized? T: Hash<SipState>>(k0: u64, k1: u64, value: &T) -> u64 {
+pub fn hash_with_keys<T: ?Sized + Hash<SipState>>(k0: u64, k1: u64, value: &T) -> u64 {
     let mut state = SipState::new_with_keys(k0, k1);
     value.hash(&mut state);
     state.result()
diff --git a/src/libcore/kinds.rs b/src/libcore/kinds.rs
index 4769c783e58..5d69938fccf 100644
--- a/src/libcore/kinds.rs
+++ b/src/libcore/kinds.rs
@@ -133,10 +133,10 @@ pub mod marker {
     /// for some lifetime `'a`, but not the other way around).
     #[lang="covariant_type"]
     #[derive(PartialEq, Eq, PartialOrd, Ord)]
-    pub struct CovariantType<Sized? T>;
+    pub struct CovariantType<T: ?Sized>;
 
-    impl<Sized? T> Copy for CovariantType<T> {}
-    impl<Sized? T> Clone for CovariantType<T> {
+    impl<T: ?Sized> Copy for CovariantType<T> {}
+    impl<T: ?Sized> Clone for CovariantType<T> {
         fn clone(&self) -> CovariantType<T> { *self }
     }
 
@@ -181,10 +181,10 @@ pub mod marker {
     /// arguments of type `U`, hence such a conversion is safe.
     #[lang="contravariant_type"]
     #[derive(PartialEq, Eq, PartialOrd, Ord)]
-    pub struct ContravariantType<Sized? T>;
+    pub struct ContravariantType<T: ?Sized>;
 
-    impl<Sized? T> Copy for ContravariantType<T> {}
-    impl<Sized? T> Clone for ContravariantType<T> {
+    impl<T: ?Sized> Copy for ContravariantType<T> {}
+    impl<T: ?Sized> Clone for ContravariantType<T> {
         fn clone(&self) -> ContravariantType<T> { *self }
     }
 
@@ -211,10 +211,10 @@ pub mod marker {
     /// interior mutability.
     #[lang="invariant_type"]
     #[derive(PartialEq, Eq, PartialOrd, Ord)]
-    pub struct InvariantType<Sized? T>;
+    pub struct InvariantType<T: ?Sized>;
 
-    impl<Sized? T> Copy for InvariantType<T> {}
-    impl<Sized? T> Clone for InvariantType<T> {
+    impl<T: ?Sized> Copy for InvariantType<T> {}
+    impl<T: ?Sized> Clone for InvariantType<T> {
         fn clone(&self) -> InvariantType<T> { *self }
     }
 
diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index 9cf3433e1ab..a8f8802de59 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -320,7 +320,7 @@ pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
 #[inline]
 #[unstable = "this function may be removed in the future due to its \
               questionable utility"]
-pub unsafe fn copy_lifetime<'a, Sized? S, Sized? T: 'a>(_ptr: &'a S,
+pub unsafe fn copy_lifetime<'a, S: ?Sized, T: ?Sized + 'a>(_ptr: &'a S,
                                                         ptr: &T) -> &'a T {
     transmute(ptr)
 }
@@ -329,7 +329,7 @@ pub unsafe fn copy_lifetime<'a, Sized? S, Sized? T: 'a>(_ptr: &'a S,
 #[inline]
 #[unstable = "this function may be removed in the future due to its \
               questionable utility"]
-pub unsafe fn copy_mut_lifetime<'a, Sized? S, Sized? T: 'a>(_ptr: &'a mut S,
+pub unsafe fn copy_mut_lifetime<'a, S: ?Sized, T: ?Sized + 'a>(_ptr: &'a mut S,
                                                             ptr: &mut T)
                                                             -> &'a mut T {
     transmute(ptr)
diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs
index 56c147d190c..97d94e73bb3 100644
--- a/src/libcore/ops.rs
+++ b/src/libcore/ops.rs
@@ -802,8 +802,8 @@ shr_impl! { uint u8 u16 u32 u64 int i8 i16 i32 i64 }
 /// }
 /// ```
 #[lang="index"]
-pub trait Index<Sized? Index> {
-    type Sized? Output;
+pub trait Index<Index: ?Sized> {
+    type Output: ?Sized;
 
     /// The method for the indexing (`Foo[Bar]`) operation
     fn index<'a>(&'a self, index: &Index) -> &'a Self::Output;
@@ -839,8 +839,8 @@ pub trait Index<Sized? Index> {
 /// }
 /// ```
 #[lang="index_mut"]
-pub trait IndexMut<Sized? Index> {
-    type Sized? Output;
+pub trait IndexMut<Index: ?Sized> {
+    type Output: ?Sized;
 
     /// The method for the indexing (`Foo[Bar]`) operation
     fn index_mut<'a>(&'a mut self, index: &Index) -> &'a mut Self::Output;
@@ -884,7 +884,7 @@ pub trait IndexMut<Sized? Index> {
 /// }
 /// ```
 #[lang="slice"]
-pub trait Slice<Sized? Idx, Sized? Result> {
+pub trait Slice<Idx: ?Sized, Result: ?Sized> {
     /// The method for the slicing operation foo[]
     fn as_slice_<'a>(&'a self) -> &'a Result;
     /// The method for the slicing operation foo[from..]
@@ -933,7 +933,7 @@ pub trait Slice<Sized? Idx, Sized? Result> {
 /// }
 /// ```
 #[lang="slice_mut"]
-pub trait SliceMut<Sized? Idx, Sized? Result> {
+pub trait SliceMut<Idx: ?Sized, Result: ?Sized> {
     /// The method for the slicing operation foo[]
     fn as_mut_slice_<'a>(&'a mut self) -> &'a mut Result;
     /// The method for the slicing operation foo[from..]
@@ -1071,7 +1071,7 @@ pub struct RangeTo<Idx> {
 #[stable]
 pub trait Deref {
     #[stable]
-    type Sized? Target;
+    type Target: ?Sized;
 
     /// The method called to dereference a value
     #[stable]
@@ -1079,14 +1079,14 @@ pub trait Deref {
 }
 
 #[stable]
-impl<'a, Sized? T> Deref for &'a T {
+impl<'a, T: ?Sized> Deref for &'a T {
     type Target = T;
 
     fn deref(&self) -> &T { *self }
 }
 
 #[stable]
-impl<'a, Sized? T> Deref for &'a mut T {
+impl<'a, T: ?Sized> Deref for &'a mut T {
     type Target = T;
 
     fn deref(&self) -> &T { *self }
@@ -1138,7 +1138,7 @@ pub trait DerefMut: Deref {
 }
 
 #[stable]
-impl<'a, Sized? T> DerefMut for &'a mut T {
+impl<'a, T: ?Sized> DerefMut for &'a mut T {
     fn deref_mut(&mut self) -> &mut T { *self }
 }
 
@@ -1166,8 +1166,8 @@ pub trait FnOnce<Args,Result> {
     extern "rust-call" fn call_once(self, args: Args) -> Result;
 }
 
-impl<Sized? F,A,R> FnMut<A,R> for F
-    where F : Fn<A,R>
+impl<F: ?Sized, A, R> FnMut<A, R> for F
+    where F : Fn<A, R>
 {
     extern "rust-call" fn call_mut(&mut self, args: A) -> R {
         self.call(args)
diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index ee6017de6e9..093ed0b242f 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -626,13 +626,13 @@ impl<T> AsSlice<T> for [T] {
 }
 
 #[experimental = "trait is experimental"]
-impl<'a, T, Sized? U: AsSlice<T>> AsSlice<T> for &'a U {
+impl<'a, T, U: ?Sized + AsSlice<T>> AsSlice<T> for &'a U {
     #[inline(always)]
     fn as_slice(&self) -> &[T] { AsSlice::as_slice(*self) }
 }
 
 #[experimental = "trait is experimental"]
-impl<'a, T, Sized? U: AsSlice<T>> AsSlice<T> for &'a mut U {
+impl<'a, T, U: ?Sized + AsSlice<T>> AsSlice<T> for &'a mut U {
     #[inline(always)]
     fn as_slice(&self) -> &[T] { AsSlice::as_slice(*self) }
 }
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 0dec61ea75e..d9749899b22 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -1155,7 +1155,7 @@ impl Str for str {
     fn as_slice<'a>(&'a self) -> &'a str { self }
 }
 
-impl<'a, Sized? S> Str for &'a S where S: Str {
+impl<'a, S: ?Sized> Str for &'a S where S: Str {
     #[inline]
     fn as_slice(&self) -> &str { Str::as_slice(*self) }
 }
diff --git a/src/libcoretest/hash/mod.rs b/src/libcoretest/hash/mod.rs
index 23f9be124da..a4bafe754ff 100644
--- a/src/libcoretest/hash/mod.rs
+++ b/src/libcoretest/hash/mod.rs
@@ -16,7 +16,7 @@ use core::hash::{Hash, Hasher, Writer};
 struct MyWriterHasher;
 
 impl Hasher<MyWriter> for MyWriterHasher {
-    fn hash<Sized? T: Hash<MyWriter>>(&self, value: &T) -> u64 {
+    fn hash<T: ?Sized + Hash<MyWriter>>(&self, value: &T) -> u64 {
         let mut state = MyWriter { hash: 0 };
         value.hash(&mut state);
         state.hash
diff --git a/src/libgraphviz/maybe_owned_vec.rs b/src/libgraphviz/maybe_owned_vec.rs
index 04aa6d16495..567fe04c5af 100644
--- a/src/libgraphviz/maybe_owned_vec.rs
+++ b/src/libgraphviz/maybe_owned_vec.rs
@@ -25,7 +25,7 @@ use std::slice;
 
 // Note 2: Once Dynamically Sized Types (DST) lands, it might be
 // reasonable to replace this with something like `enum MaybeOwned<'a,
-// Sized? U>{ Owned(Box<U>), Borrowed(&'a U) }`; and then `U` could be
+// U: ?Sized>{ Owned(Box<U>), Borrowed(&'a U) }`; and then `U` could be
 // instantiated with `[T]` or `str`, etc.  Of course, that would imply
 // removing the `Growable` variant, which relates to note 1 above.
 // Alternatively, we might add `MaybeOwned` for the general case but
diff --git a/src/librustc/middle/intrinsicck.rs b/src/librustc/middle/intrinsicck.rs
index e3763689ef4..a83416667ab 100644
--- a/src/librustc/middle/intrinsicck.rs
+++ b/src/librustc/middle/intrinsicck.rs
@@ -121,7 +121,7 @@ impl<'a, 'tcx> IntrinsicCheckingVisitor<'a, 'tcx> {
         // However, it's not as simple as checking whether `T :
         // Sized`, because even if `T : Sized` does not hold, that
         // just means that `T` *may* not be sized.  After all, even a
-        // type parameter `Sized? T` could be bound to a sized
+        // type parameter `T: ?Sized` could be bound to a sized
         // type. (Issue #20116)
         //
         // To handle this, we first check for "interior" type
@@ -139,16 +139,16 @@ impl<'a, 'tcx> IntrinsicCheckingVisitor<'a, 'tcx> {
         // exhaustively checking all possible combinations. Here are some examples:
         //
         // ```
-        // fn foo<T,U>() {
+        // fn foo<T, U>() {
         //     // T=int, U=int
         // }
         //
-        // fn bar<Sized? T,U>() {
+        // fn bar<T: ?Sized, U>() {
         //     // T=int, U=int
         //     // T=[int], U=int
         // }
         //
-        // fn baz<Sized? T, Sized?U>() {
+        // fn baz<T: ?Sized, U: ?Sized>() {
         //     // T=int, U=int
         //     // T=[int], U=int
         //     // T=int, U=[int]
diff --git a/src/librustc/util/nodemap.rs b/src/librustc/util/nodemap.rs
index 0da01cd3589..ee224d1ec80 100644
--- a/src/librustc/util/nodemap.rs
+++ b/src/librustc/util/nodemap.rs
@@ -75,7 +75,7 @@ pub struct FnvHasher;
 pub struct FnvState(u64);
 
 impl Hasher<FnvState> for FnvHasher {
-    fn hash<Sized? T: Hash<FnvState>>(&self, t: &T) -> u64 {
+    fn hash<T: ?Sized + Hash<FnvState>>(&self, t: &T) -> u64 {
         let mut state = FnvState(0xcbf29ce484222325);
         t.hash(&mut state);
         let FnvState(ret) = state;
diff --git a/src/librustc/util/ppaux.rs b/src/librustc/util/ppaux.rs
index 70712fd4e3b..8c2a9993004 100644
--- a/src/librustc/util/ppaux.rs
+++ b/src/librustc/util/ppaux.rs
@@ -601,7 +601,7 @@ impl<'tcx> Repr<'tcx> for () {
     }
 }
 
-impl<'a, 'tcx, Sized? T:Repr<'tcx>> Repr<'tcx> for &'a T {
+impl<'a, 'tcx, T: ?Sized +Repr<'tcx>> Repr<'tcx> for &'a T {
     fn repr(&self, tcx: &ctxt<'tcx>) -> String {
         Repr::repr(*self, tcx)
     }
diff --git a/src/libserialize/serialize.rs b/src/libserialize/serialize.rs
index 943843c6cc8..a04f67f7651 100644
--- a/src/libserialize/serialize.rs
+++ b/src/libserialize/serialize.rs
@@ -396,13 +396,13 @@ impl Decodable for () {
     }
 }
 
-impl<'a, Sized? T: Encodable> Encodable for &'a T {
+impl<'a, T: ?Sized + Encodable> Encodable for &'a T {
     fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
         (**self).encode(s)
     }
 }
 
-impl<Sized? T: Encodable> Encodable for Box<T> {
+impl<T: ?Sized + Encodable> Encodable for Box<T> {
     fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
         (**self).encode(s)
     }
diff --git a/src/libserialize/serialize_stage0.rs b/src/libserialize/serialize_stage0.rs
index 558f9e603e1..c4317b99dce 100644
--- a/src/libserialize/serialize_stage0.rs
+++ b/src/libserialize/serialize_stage0.rs
@@ -378,13 +378,13 @@ impl<E, D:Decoder<E>> Decodable<D, E> for () {
     }
 }
 
-impl<'a, E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for &'a T {
+impl<'a, E, S: Encoder<E>, T: ?Sized + Encodable<S, E>> Encodable<S, E> for &'a T {
     fn encode(&self, s: &mut S) -> Result<(), E> {
         (**self).encode(s)
     }
 }
 
-impl<E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for Box<T> {
+impl<E, S: Encoder<E>, T: ?Sized + Encodable<S, E>> Encodable<S, E> for Box<T> {
     fn encode(&self, s: &mut S) -> Result<(), E> {
         (**self).encode(s)
     }
diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
index ce2be39a416..a3fc38c34e8 100644
--- a/src/libstd/collections/hash/map.rs
+++ b/src/libstd/collections/hash/map.rs
@@ -440,14 +440,14 @@ impl<K, V, M> SearchResult<K, V, M> {
 }
 
 impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
-    fn make_hash<Sized? X: Hash<S>>(&self, x: &X) -> SafeHash {
+    fn make_hash<X: ?Sized + Hash<S>>(&self, x: &X) -> SafeHash {
         table::make_hash(&self.hasher, x)
     }
 
     /// Search for a key, yielding the index if it's found in the hashtable.
     /// If you already have the hash for the key lying around, use
     /// search_hashed.
-    fn search<'a, Sized? Q>(&'a self, q: &Q) -> Option<FullBucketImm<'a, K, V>>
+    fn search<'a, Q: ?Sized>(&'a self, q: &Q) -> Option<FullBucketImm<'a, K, V>>
         where Q: BorrowFrom<K> + Eq + Hash<S>
     {
         let hash = self.make_hash(q);
@@ -455,7 +455,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
             .into_option()
     }
 
-    fn search_mut<'a, Sized? Q>(&'a mut self, q: &Q) -> Option<FullBucketMut<'a, K, V>>
+    fn search_mut<'a, Q: ?Sized>(&'a mut self, q: &Q) -> Option<FullBucketMut<'a, K, V>>
         where Q: BorrowFrom<K> + Eq + Hash<S>
     {
         let hash = self.make_hash(q);
@@ -923,7 +923,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     #[stable]
     /// Gets the given key's corresponding entry in the map for in-place manipulation.
     /// Regardless of whether or not `to_owned()` has been called, the key must hash the same way.
-    pub fn entry<'a, Sized? Q>(&'a mut self, key: &'a Q) -> Entry<'a, Q, K, V>
+    pub fn entry<'a, Q: ?Sized>(&'a mut self, key: &'a Q) -> Entry<'a, Q, K, V>
         where Q: Eq + Hash<S> + ToOwned<K>
     {
         // Gotta resize now.
@@ -1030,7 +1030,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     /// assert_eq!(map.get(&2), None);
     /// ```
     #[stable]
-    pub fn get<Sized? Q>(&self, k: &Q) -> Option<&V>
+    pub fn get<Q: ?Sized>(&self, k: &Q) -> Option<&V>
         where Q: Hash<S> + Eq + BorrowFrom<K>
     {
         self.search(k).map(|bucket| bucket.into_refs().1)
@@ -1053,7 +1053,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     /// assert_eq!(map.contains_key(&2), false);
     /// ```
     #[stable]
-    pub fn contains_key<Sized? Q>(&self, k: &Q) -> bool
+    pub fn contains_key<Q: ?Sized>(&self, k: &Q) -> bool
         where Q: Hash<S> + Eq + BorrowFrom<K>
     {
         self.search(k).is_some()
@@ -1079,7 +1079,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     /// assert_eq!(map[1], "b");
     /// ```
     #[stable]
-    pub fn get_mut<Sized? Q>(&mut self, k: &Q) -> Option<&mut V>
+    pub fn get_mut<Q: ?Sized>(&mut self, k: &Q) -> Option<&mut V>
         where Q: Hash<S> + Eq + BorrowFrom<K>
     {
         self.search_mut(k).map(|bucket| bucket.into_mut_refs().1)
@@ -1131,7 +1131,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     /// assert_eq!(map.remove(&1), None);
     /// ```
     #[stable]
-    pub fn remove<Sized? Q>(&mut self, k: &Q) -> Option<V>
+    pub fn remove<Q: ?Sized>(&mut self, k: &Q) -> Option<V>
         where Q: Hash<S> + Eq + BorrowFrom<K>
     {
         if self.table.size() == 0 {
@@ -1142,7 +1142,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S>> HashMap<K, V, H> {
     }
 }
 
-fn search_entry_hashed<'a, K, V, Sized? Q>(table: &'a mut RawTable<K,V>, hash: SafeHash, k: &'a Q)
+fn search_entry_hashed<'a, K, V, Q: ?Sized>(table: &'a mut RawTable<K,V>, hash: SafeHash, k: &'a Q)
         -> Entry<'a, Q, K, V>
     where Q: Eq + ToOwned<K>
 {
@@ -1227,7 +1227,7 @@ impl<K: Eq + Hash<S>, V, S, H: Hasher<S> + Default> Default for HashMap<K, V, H>
 }
 
 #[stable]
-impl<K: Hash<S> + Eq, Sized? Q, V, S, H: Hasher<S>> Index<Q> for HashMap<K, V, H>
+impl<K: Hash<S> + Eq, Q: ?Sized, V, S, H: Hasher<S>> Index<Q> for HashMap<K, V, H>
     where Q: BorrowFrom<K> + Hash<S> + Eq
 {
     type Output = V;
@@ -1239,7 +1239,7 @@ impl<K: Hash<S> + Eq, Sized? Q, V, S, H: Hasher<S>> Index<Q> for HashMap<K, V, H
 }
 
 #[stable]
-impl<K: Hash<S> + Eq, Sized? Q, V, S, H: Hasher<S>> IndexMut<Q> for HashMap<K, V, H>
+impl<K: Hash<S> + Eq, Q: ?Sized, V, S, H: Hasher<S>> IndexMut<Q> for HashMap<K, V, H>
     where Q: BorrowFrom<K> + Hash<S> + Eq
 {
     type Output = V;
@@ -1331,7 +1331,7 @@ pub struct OccupiedEntry<'a, K: 'a, V: 'a> {
 
 #[stable]
 /// A view into a single empty location in a HashMap
-pub struct VacantEntry<'a, Sized? Q: 'a, K: 'a, V: 'a> {
+pub struct VacantEntry<'a, Q: ?Sized + 'a, K: 'a, V: 'a> {
     hash: SafeHash,
     key: &'a Q,
     elem: VacantEntryState<K, V, &'a mut RawTable<K, V>>,
@@ -1339,7 +1339,7 @@ pub struct VacantEntry<'a, Sized? Q: 'a, K: 'a, V: 'a> {
 
 #[stable]
 /// A view into a single location in a map, which may be vacant or occupied
-pub enum Entry<'a, Sized? Q: 'a, K: 'a, V: 'a> {
+pub enum Entry<'a, Q: ?Sized + 'a, K: 'a, V: 'a> {
     /// An occupied Entry
     Occupied(OccupiedEntry<'a, K, V>),
     /// A vacant Entry
@@ -1409,7 +1409,7 @@ impl<'a, K: 'a, V: 'a> Iterator for Drain<'a, K, V> {
     }
 }
 
-impl<'a, Sized? Q, K, V> Entry<'a, Q, K, V> {
+impl<'a, Q: ?Sized, K, V> Entry<'a, Q, K, V> {
     #[unstable = "matches collection reform v2 specification, waiting for dust to settle"]
     /// Returns a mutable reference to the entry if occupied, or the VacantEntry if vacant
     pub fn get(self) -> Result<&'a mut V, VacantEntry<'a, Q, K, V>> {
@@ -1455,7 +1455,7 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
     }
 }
 
-impl<'a, Sized? Q: 'a + ToOwned<K>, K: 'a, V: 'a> VacantEntry<'a, Q, K, V> {
+impl<'a, Q: ?Sized + 'a + ToOwned<K>, K: 'a, V: 'a> VacantEntry<'a, Q, K, V> {
     #[stable]
     /// Sets the value of the entry with the VacantEntry's key,
     /// and returns a mutable reference to it
diff --git a/src/libstd/collections/hash/set.rs b/src/libstd/collections/hash/set.rs
index bfaf69942a6..91a5db2ba76 100644
--- a/src/libstd/collections/hash/set.rs
+++ b/src/libstd/collections/hash/set.rs
@@ -451,7 +451,7 @@ impl<T: Eq + Hash<S>, S, H: Hasher<S>> HashSet<T, H> {
     /// assert_eq!(set.contains(&4), false);
     /// ```
     #[stable]
-    pub fn contains<Sized? Q>(&self, value: &Q) -> bool
+    pub fn contains<Q: ?Sized>(&self, value: &Q) -> bool
         where Q: BorrowFrom<T> + Hash<S> + Eq
     {
         self.map.contains_key(value)
@@ -561,7 +561,7 @@ impl<T: Eq + Hash<S>, S, H: Hasher<S>> HashSet<T, H> {
     /// assert_eq!(set.remove(&2), false);
     /// ```
     #[stable]
-    pub fn remove<Sized? Q>(&mut self, value: &Q) -> bool
+    pub fn remove<Q: ?Sized>(&mut self, value: &Q) -> bool
         where Q: BorrowFrom<T> + Hash<S> + Eq
     {
         self.map.remove(value).is_some()
diff --git a/src/libstd/collections/hash/table.rs b/src/libstd/collections/hash/table.rs
index ab91beb4f9b..1eb4408eedc 100644
--- a/src/libstd/collections/hash/table.rs
+++ b/src/libstd/collections/hash/table.rs
@@ -138,7 +138,7 @@ impl SafeHash {
 /// We need to remove hashes of 0. That's reserved for empty buckets.
 /// This function wraps up `hash_keyed` to be the only way outside this
 /// module to generate a SafeHash.
-pub fn make_hash<Sized? T: Hash<S>, S, H: Hasher<S>>(hasher: &H, t: &T) -> SafeHash {
+pub fn make_hash<T: ?Sized + Hash<S>, S, H: Hasher<S>>(hasher: &H, t: &T) -> SafeHash {
     // We need to avoid 0u64 in order to prevent collisions with
     // EMPTY_HASH. We can maintain our precious uniform distribution
     // of initial indexes by unconditionally setting the MSB,
diff --git a/src/libstd/hash.rs b/src/libstd/hash.rs
index cdd0e9bf76f..ac2b01e995e 100644
--- a/src/libstd/hash.rs
+++ b/src/libstd/hash.rs
@@ -90,7 +90,7 @@ impl RandomSipHasher {
 
 impl Hasher<sip::SipState> for RandomSipHasher {
     #[inline]
-    fn hash<Sized? T: Hash<sip::SipState>>(&self, value: &T) -> u64 {
+    fn hash<T: ?Sized + Hash<sip::SipState>>(&self, value: &T) -> u64 {
         self.hasher.hash(value)
     }
 }
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 3fa0b5645c5..66416a21dd9 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1012,12 +1012,12 @@ pub trait Writer {
     fn write_fmt(&mut self, fmt: fmt::Arguments) -> IoResult<()> {
         // Create a shim which translates a Writer to a fmt::Writer and saves
         // off I/O errors. instead of discarding them
-        struct Adaptor<'a, Sized? T:'a> {
+        struct Adaptor<'a, T: ?Sized +'a> {
             inner: &'a mut T,
             error: IoResult<()>,
         }
 
-        impl<'a, Sized? T: Writer> fmt::Writer for Adaptor<'a, T> {
+        impl<'a, T: ?Sized + Writer> fmt::Writer for Adaptor<'a, T> {
             fn write_str(&mut self, s: &str) -> fmt::Result {
                 match self.inner.write(s.as_bytes()) {
                     Ok(()) => Ok(()),
@@ -1597,11 +1597,11 @@ pub trait Acceptor<T> {
 /// `Some`. The `Some` contains the `IoResult` representing whether the
 /// connection attempt was successful.  A successful connection will be wrapped
 /// in `Ok`. A failed connection is represented as an `Err`.
-pub struct IncomingConnections<'a, Sized? A:'a> {
+pub struct IncomingConnections<'a, A: ?Sized +'a> {
     inc: &'a mut A,
 }
 
-impl<'a, T, Sized? A: Acceptor<T>> Iterator for IncomingConnections<'a, A> {
+impl<'a, T, A: ?Sized + Acceptor<T>> Iterator for IncomingConnections<'a, A> {
     type Item = IoResult<T>;
 
     fn next(&mut self) -> Option<IoResult<T>> {
diff --git a/src/libstd/path/mod.rs b/src/libstd/path/mod.rs
index a2d69a7e7dc..b020164158c 100644
--- a/src/libstd/path/mod.rs
+++ b/src/libstd/path/mod.rs
@@ -896,7 +896,7 @@ impl BytesContainer for CString {
     }
 }
 
-impl<'a, Sized? T: BytesContainer> BytesContainer for &'a T {
+impl<'a, T: ?Sized + BytesContainer> BytesContainer for &'a T {
     #[inline]
     fn container_as_bytes(&self) -> &[u8] {
         (**self).container_as_bytes()
diff --git a/src/libstd/path/posix.rs b/src/libstd/path/posix.rs
index 013212b2705..1df02101ed0 100644
--- a/src/libstd/path/posix.rs
+++ b/src/libstd/path/posix.rs
@@ -321,7 +321,7 @@ impl Path {
 
     /// Returns a normalized byte vector representation of a path, by removing all empty
     /// components, and unnecessary . and .. components.
-    fn normalize<Sized? V: AsSlice<u8>>(v: &V) -> Vec<u8> {
+    fn normalize<V: ?Sized + AsSlice<u8>>(v: &V) -> Vec<u8> {
         // borrowck is being very picky
         let val = {
             let is_abs = !v.as_slice().is_empty() && v.as_slice()[0] == SEP_BYTE;
diff --git a/src/libsyntax/parse/obsolete.rs b/src/libsyntax/parse/obsolete.rs
index f4606a4e6da..a49680d7e1c 100644
--- a/src/libsyntax/parse/obsolete.rs
+++ b/src/libsyntax/parse/obsolete.rs
@@ -13,8 +13,6 @@
 //!
 //! Obsolete syntax that becomes too hard to parse can be removed.
 
-pub use self::ObsoleteSyntax::*;
-
 use ast::{Expr, ExprTup};
 use codemap::Span;
 use parse::parser;
@@ -24,18 +22,19 @@ use ptr::P;
 /// The specific types of unsupported syntax
 #[derive(Copy, PartialEq, Eq, Hash)]
 pub enum ObsoleteSyntax {
-    ObsoleteForSized,
-    ObsoleteOwnedType,
-    ObsoleteOwnedExpr,
-    ObsoleteOwnedPattern,
-    ObsoleteOwnedVector,
-    ObsoleteOwnedSelf,
-    ObsoleteImportRenaming,
-    ObsoleteSubsliceMatch,
-    ObsoleteExternCrateRenaming,
-    ObsoleteProcType,
-    ObsoleteProcExpr,
-    ObsoleteClosureType,
+    Sized,
+    ForSized,
+    OwnedType,
+    OwnedExpr,
+    OwnedPattern,
+    OwnedVector,
+    OwnedSelf,
+    ImportRenaming,
+    SubsliceMatch,
+    ExternCrateRenaming,
+    ProcType,
+    ProcExpr,
+    ClosureType,
 }
 
 pub trait ParserObsoleteMethods {
@@ -57,55 +56,59 @@ impl<'a> ParserObsoleteMethods for parser::Parser<'a> {
     /// Reports an obsolete syntax non-fatal error.
     fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax) {
         let (kind_str, desc) = match kind {
-            ObsoleteForSized => (
+            ObsoleteSyntax::ForSized => (
                 "for Sized?",
                 "no longer required. Traits (and their `Self` type) do not have the `Sized` bound \
                  by default",
             ),
-            ObsoleteProcType => (
+            ObsoleteSyntax::ProcType => (
                 "the `proc` type",
                 "use unboxed closures instead",
             ),
-            ObsoleteProcExpr => (
+            ObsoleteSyntax::ProcExpr => (
                 "`proc` expression",
                 "use a `move ||` expression instead",
             ),
-            ObsoleteOwnedType => (
+            ObsoleteSyntax::OwnedType => (
                 "`~` notation for owned pointers",
                 "use `Box<T>` in `std::owned` instead"
             ),
-            ObsoleteOwnedExpr => (
+            ObsoleteSyntax::OwnedExpr => (
                 "`~` notation for owned pointer allocation",
                 "use the `box` operator instead of `~`"
             ),
-            ObsoleteOwnedPattern => (
+            ObsoleteSyntax::OwnedPattern => (
                 "`~` notation for owned pointer patterns",
                 "use the `box` operator instead of `~`"
             ),
-            ObsoleteOwnedVector => (
+            ObsoleteSyntax::OwnedVector => (
                 "`~[T]` is no longer a type",
                 "use the `Vec` type instead"
             ),
-            ObsoleteOwnedSelf => (
+            ObsoleteSyntax::OwnedSelf => (
                 "`~self` is no longer supported",
                 "write `self: Box<Self>` instead"
             ),
-            ObsoleteImportRenaming => (
+            ObsoleteSyntax::ImportRenaming => (
                 "`use foo = bar` syntax",
                 "write `use bar as foo` instead"
             ),
-            ObsoleteSubsliceMatch => (
+            ObsoleteSyntax::SubsliceMatch => (
                 "subslice match syntax",
                 "instead of `..xs`, write `xs..` in a pattern"
             ),
-            ObsoleteExternCrateRenaming => (
+            ObsoleteSyntax::ExternCrateRenaming => (
                 "`extern crate foo = bar` syntax",
                 "write `extern crate bar as foo` instead"
             ),
-            ObsoleteClosureType => (
+            ObsoleteSyntax::ClosureType => (
                 "`|uint| -> bool` closure type syntax",
                 "use unboxed closures instead, no type annotation needed"
-            )
+            ),
+            ObsoleteSyntax::Sized => (
+                "`Sized? T` syntax for removing the `Sized` bound",
+                "write `T: ?Sized` instead"
+            ),
         };
 
         self.report(sp, kind, kind_str, desc);
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 2eb77489c6e..58b08757cdf 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1155,7 +1155,7 @@ impl<'a> Parser<'a> {
         let _ = self.parse_colon_then_ty_param_bounds(BoundParsingMode::Bare);
         let _ = self.parse_ret_ty();
 
-        self.obsolete(proc_span, ObsoleteProcType);
+        self.obsolete(proc_span, ObsoleteSyntax::ProcType);
 
         TyInfer
     }
@@ -1511,8 +1511,10 @@ impl<'a> Parser<'a> {
             self.bump();
             let last_span = self.last_span;
             match self.token {
-                token::OpenDelim(token::Bracket) => self.obsolete(last_span, ObsoleteOwnedVector),
-                _ => self.obsolete(last_span, ObsoleteOwnedType)
+                token::OpenDelim(token::Bracket) => {
+                    self.obsolete(last_span, ObsoleteSyntax::OwnedVector)
+                }
+                _ => self.obsolete(last_span, ObsoleteSyntax::OwnedType)
             }
             TyTup(vec![self.parse_ty()])
         } else if self.check(&token::BinOp(token::Star)) {
@@ -2275,7 +2277,7 @@ impl<'a> Parser<'a> {
                     let span = self.last_span;
                     let _ = self.parse_proc_decl();
                     let _ = self.parse_expr();
-                    return self.obsolete_expr(span, ObsoleteProcExpr);
+                    return self.obsolete_expr(span, ObsoleteSyntax::ProcExpr);
                 }
                 if self.eat_keyword(keywords::If) {
                     return self.parse_if_expr();
@@ -2850,9 +2852,9 @@ impl<'a> Parser<'a> {
             let last_span = self.last_span;
             match self.token {
                 token::OpenDelim(token::Bracket) => {
-                    self.obsolete(last_span, ObsoleteOwnedVector)
+                    self.obsolete(last_span, ObsoleteSyntax::OwnedVector)
                 },
-                _ => self.obsolete(last_span, ObsoleteOwnedExpr)
+                _ => self.obsolete(last_span, ObsoleteSyntax::OwnedExpr)
             }
 
             let e = self.parse_prefix_expr();
@@ -3227,7 +3229,7 @@ impl<'a> Parser<'a> {
                     } else {
                         let _ = self.parse_pat();
                         let span = self.span;
-                        self.obsolete(span, ObsoleteSubsliceMatch);
+                        self.obsolete(span, ObsoleteSyntax::SubsliceMatch);
                     }
                     continue
                 }
@@ -3343,7 +3345,7 @@ impl<'a> Parser<'a> {
             pat = PatBox(sub);
             let last_span = self.last_span;
             hi = last_span.hi;
-            self.obsolete(last_span, ObsoleteOwnedPattern);
+            self.obsolete(last_span, ObsoleteSyntax::OwnedPattern);
             return P(ast::Pat {
                 id: ast::DUMMY_NODE_ID,
                 node: pat,
@@ -4090,8 +4092,8 @@ impl<'a> Parser<'a> {
         // unbound, and it may only be `Sized`. To avoid backtracking and other
         // complications, we parse an ident, then check for `?`. If we find it,
         // we use the ident as the unbound, otherwise, we use it as the name of
-        // type param. Even worse, for now, we need to check for `?` before or
-        // after the bound.
+        // type param. Even worse, we need to check for `?` before or after the
+        // bound.
         let mut span = self.span;
         let mut ident = self.parse_ident();
         let mut unbound = None;
@@ -4100,6 +4102,7 @@ impl<'a> Parser<'a> {
             unbound = Some(tref);
             span = self.span;
             ident = self.parse_ident();
+            self.obsolete(span, ObsoleteSyntax::Sized);
         }
 
         let mut bounds = self.parse_colon_then_ty_param_bounds(BoundParsingMode::Modified);
@@ -4463,7 +4466,7 @@ impl<'a> Parser<'a> {
                     self.bump();
                     drop(self.expect_self_ident());
                     let last_span = self.last_span;
-                    self.obsolete(last_span, ObsoleteOwnedSelf)
+                    self.obsolete(last_span, ObsoleteSyntax::OwnedSelf)
                 }
                 SelfStatic
             }
@@ -4514,7 +4517,7 @@ impl<'a> Parser<'a> {
                     self.bump();
                     drop(self.expect_self_ident());
                     let last_span = self.last_span;
-                    self.obsolete(last_span, ObsoleteOwnedSelf);
+                    self.obsolete(last_span, ObsoleteSyntax::OwnedSelf);
                     SelfStatic
                 } else {
                     SelfStatic
@@ -5396,7 +5399,7 @@ impl<'a> Parser<'a> {
                     self.bump();
                     let path = self.parse_str();
                     let span = self.span;
-                    self.obsolete(span, ObsoleteExternCrateRenaming);
+                    self.obsolete(span, ObsoleteSyntax::ExternCrateRenaming);
                     Some(path)
                 } else if self.eat_keyword(keywords::As) {
                     // skip the ident if there is one
@@ -6053,7 +6056,7 @@ impl<'a> Parser<'a> {
                 path.push(id);
             }
             let span = mk_sp(path_lo, self.span.hi);
-            self.obsolete(span, ObsoleteImportRenaming);
+            self.obsolete(span, ObsoleteSyntax::ImportRenaming);
             let path = ast::Path {
                 span: span,
                 global: false,
diff --git a/src/libsyntax/util/interner.rs b/src/libsyntax/util/interner.rs
index 5f416a867e8..85eea2d9daf 100644
--- a/src/libsyntax/util/interner.rs
+++ b/src/libsyntax/util/interner.rs
@@ -77,7 +77,7 @@ impl<T: Eq + Hash + Clone + 'static> Interner<T> {
         (*vect).len()
     }
 
-    pub fn find<Sized? Q>(&self, val: &Q) -> Option<Name>
+    pub fn find<Q: ?Sized>(&self, val: &Q) -> Option<Name>
     where Q: BorrowFrom<T> + Eq + Hash {
         let map = self.map.borrow();
         match (*map).get(val) {
@@ -202,7 +202,7 @@ impl StrInterner {
         self.vect.borrow().len()
     }
 
-    pub fn find<Sized? Q>(&self, val: &Q) -> Option<Name>
+    pub fn find<Q: ?Sized>(&self, val: &Q) -> Option<Name>
     where Q: BorrowFrom<RcStr> + Eq + Hash {
         match (*self.map.borrow()).get(val) {
             Some(v) => Some(*v),
diff --git a/src/test/compile-fail/associated-types-unsized.rs b/src/test/compile-fail/associated-types-unsized.rs
index 5ae2f65fb2e..db39eafc191 100644
--- a/src/test/compile-fail/associated-types-unsized.rs
+++ b/src/test/compile-fail/associated-types-unsized.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 trait Get {
-    type Sized? Value;
+    type Value: ?Sized;
     fn get(&self) -> <Self as Get>::Value;
 }
 
diff --git a/src/test/compile-fail/dst-bad-assign-2.rs b/src/test/compile-fail/dst-bad-assign-2.rs
index fcc08cfcb16..5e360b6ab9b 100644
--- a/src/test/compile-fail/dst-bad-assign-2.rs
+++ b/src/test/compile-fail/dst-bad-assign-2.rs
@@ -10,7 +10,7 @@
 
 // Forbid assignment into a dynamically sized type.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     f1: int,
     f2: &'static str,
     ptr: T
diff --git a/src/test/compile-fail/dst-bad-assign.rs b/src/test/compile-fail/dst-bad-assign.rs
index eb54f3f8e78..cc709be9900 100644
--- a/src/test/compile-fail/dst-bad-assign.rs
+++ b/src/test/compile-fail/dst-bad-assign.rs
@@ -10,7 +10,7 @@
 
 // Forbid assignment into a dynamically sized type.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     f1: int,
     f2: &'static str,
     ptr: T
diff --git a/src/test/compile-fail/dst-bad-coerce1.rs b/src/test/compile-fail/dst-bad-coerce1.rs
index c77ae25e0cf..75bd94331b1 100644
--- a/src/test/compile-fail/dst-bad-coerce1.rs
+++ b/src/test/compile-fail/dst-bad-coerce1.rs
@@ -10,7 +10,7 @@
 
 // Attempt to change the type as well as unsizing.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     ptr: T
 }
 
diff --git a/src/test/compile-fail/dst-bad-coerce2.rs b/src/test/compile-fail/dst-bad-coerce2.rs
index 6eb650e9781..54c625221ba 100644
--- a/src/test/compile-fail/dst-bad-coerce2.rs
+++ b/src/test/compile-fail/dst-bad-coerce2.rs
@@ -10,7 +10,7 @@
 
 // Attempt to change the mutability as well as unsizing.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     ptr: T
 }
 
diff --git a/src/test/compile-fail/dst-bad-coerce3.rs b/src/test/compile-fail/dst-bad-coerce3.rs
index b0bd5176374..192d43e32fd 100644
--- a/src/test/compile-fail/dst-bad-coerce3.rs
+++ b/src/test/compile-fail/dst-bad-coerce3.rs
@@ -10,7 +10,7 @@
 
 // Attempt to extend the lifetime as well as unsizing.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     ptr: T
 }
 
diff --git a/src/test/compile-fail/dst-bad-coerce4.rs b/src/test/compile-fail/dst-bad-coerce4.rs
index 783a32d6302..53ce18c73a0 100644
--- a/src/test/compile-fail/dst-bad-coerce4.rs
+++ b/src/test/compile-fail/dst-bad-coerce4.rs
@@ -10,7 +10,7 @@
 
 // Attempt to coerce from unsized to sized.
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     ptr: T
 }
 
diff --git a/src/test/compile-fail/dst-bad-coercions.rs b/src/test/compile-fail/dst-bad-coercions.rs
index c3a814e3f44..b30eada162b 100644
--- a/src/test/compile-fail/dst-bad-coercions.rs
+++ b/src/test/compile-fail/dst-bad-coercions.rs
@@ -14,7 +14,7 @@ struct S;
 trait T {}
 impl T for S {}
 
-struct Foo<Sized? T> {
+struct Foo<T: ?Sized> {
     f: T
 }
 
diff --git a/src/test/compile-fail/dst-bad-deep.rs b/src/test/compile-fail/dst-bad-deep.rs
index 0833a74f1da..b169824cb3a 100644
--- a/src/test/compile-fail/dst-bad-deep.rs
+++ b/src/test/compile-fail/dst-bad-deep.rs
@@ -13,7 +13,7 @@
 // because it would require stack allocation of an unsized temporary (*g in the
 // test).
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     ptr: T
 }
 
diff --git a/src/test/compile-fail/dst-object-from-unsized-type.rs b/src/test/compile-fail/dst-object-from-unsized-type.rs
index 4e5a6be1bc7..3c75b5b6edd 100644
--- a/src/test/compile-fail/dst-object-from-unsized-type.rs
+++ b/src/test/compile-fail/dst-object-from-unsized-type.rs
@@ -13,12 +13,12 @@
 trait Foo {}
 impl Foo for str {}
 
-fn test1<Sized? T: Foo>(t: &T) {
+fn test1<T: ?Sized + Foo>(t: &T) {
     let u: &Foo = t;
     //~^ ERROR `core::kinds::Sized` is not implemented for the type `T`
 }
 
-fn test2<Sized? T: Foo>(t: &T) {
+fn test2<T: ?Sized + Foo>(t: &T) {
     let v: &Foo = t as &Foo;
     //~^ ERROR `core::kinds::Sized` is not implemented for the type `T`
 }
diff --git a/src/test/compile-fail/transmute-fat-pointers.rs b/src/test/compile-fail/transmute-fat-pointers.rs
index 5e81a4cec22..31456853e1c 100644
--- a/src/test/compile-fail/transmute-fat-pointers.rs
+++ b/src/test/compile-fail/transmute-fat-pointers.rs
@@ -14,11 +14,11 @@
 
 use std::mem::transmute;
 
-fn a<T, Sized? U>(x: &[T]) -> &U {
+fn a<T, U: ?Sized>(x: &[T]) -> &U {
     unsafe { transmute(x) } //~ ERROR transmute called on types with potentially different sizes
 }
 
-fn b<Sized? T, Sized? U>(x: &T) -> &U {
+fn b<T: ?Sized, U: ?Sized>(x: &T) -> &U {
     unsafe { transmute(x) } //~ ERROR transmute called on types with potentially different sizes
 }
 
@@ -30,11 +30,11 @@ fn d<T, U>(x: &[T]) -> &[U] {
     unsafe { transmute(x) }
 }
 
-fn e<Sized? T, U>(x: &T) -> &U {
+fn e<T: ?Sized, U>(x: &T) -> &U {
     unsafe { transmute(x) } //~ ERROR transmute called on types with potentially different sizes
 }
 
-fn f<T, Sized? U>(x: &T) -> &U {
+fn f<T, U: ?Sized>(x: &T) -> &U {
     unsafe { transmute(x) } //~ ERROR transmute called on types with potentially different sizes
 }
 
diff --git a/src/test/compile-fail/transmute-impl.rs b/src/test/compile-fail/transmute-impl.rs
index 8b5a8c679b2..a68bba285df 100644
--- a/src/test/compile-fail/transmute-impl.rs
+++ b/src/test/compile-fail/transmute-impl.rs
@@ -14,11 +14,11 @@
 
 use std::mem::transmute;
 
-struct Foo<Sized? T> {
+struct Foo<T: ?Sized> {
     t: Box<T>
 }
 
-impl<Sized? T> Foo<T> {
+impl<T: ?Sized> Foo<T> {
     fn m(x: &T) -> &int where T : Sized {
         // OK here, because T : Sized is in scope.
         unsafe { transmute(x) }
diff --git a/src/test/compile-fail/unboxed-closure-sugar-default.rs b/src/test/compile-fail/unboxed-closure-sugar-default.rs
index 2324e8ed535..82355ddf681 100644
--- a/src/test/compile-fail/unboxed-closure-sugar-default.rs
+++ b/src/test/compile-fail/unboxed-closure-sugar-default.rs
@@ -18,9 +18,9 @@ trait Foo<T,U,V=T> {
     fn dummy(&self, t: T, u: U, v: V);
 }
 
-trait Eq<Sized? X> { }
-impl<Sized? X> Eq<X> for X { }
-fn eq<Sized? A,Sized? B>() where A : Eq<B> { }
+trait Eq<X: ?Sized> { }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized>() where A : Eq<B> { }
 
 fn test<'a,'b>() {
     // Parens are equivalent to omitting default in angle.
diff --git a/src/test/compile-fail/unboxed-closure-sugar-equiv.rs b/src/test/compile-fail/unboxed-closure-sugar-equiv.rs
index 2b2327277a2..f36fad30670 100644
--- a/src/test/compile-fail/unboxed-closure-sugar-equiv.rs
+++ b/src/test/compile-fail/unboxed-closure-sugar-equiv.rs
@@ -20,9 +20,9 @@ trait Foo<T,U> {
     fn dummy(&self, t: T, u: U);
 }
 
-trait Eq<Sized? X> { }
-impl<Sized? X> Eq<X> for X { }
-fn eq<Sized? A,Sized? B:Eq<A>>() { }
+trait Eq<X: ?Sized> { }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
 
 fn test<'a,'b>() {
     // No errors expected:
diff --git a/src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs b/src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs
index 9ec6428de27..2617be295cd 100644
--- a/src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs
+++ b/src/test/compile-fail/unboxed-closure-sugar-lifetime-elision.rs
@@ -20,9 +20,9 @@ trait Foo<T,U> {
     fn dummy(&self, t: T, u: U);
 }
 
-trait Eq<Sized? X> { }
-impl<Sized? X> Eq<X> for X { }
-fn eq<Sized? A,Sized? B:Eq<A>>() { }
+trait Eq<X: ?Sized> { }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
 
 fn main() {
     eq::< for<'a> Foo<(&'a int,), &'a int>,
diff --git a/src/test/compile-fail/unboxed-closure-sugar-region.rs b/src/test/compile-fail/unboxed-closure-sugar-region.rs
index 5faa82fdf55..5ace9e115ec 100644
--- a/src/test/compile-fail/unboxed-closure-sugar-region.rs
+++ b/src/test/compile-fail/unboxed-closure-sugar-region.rs
@@ -21,9 +21,9 @@ trait Foo<'a,T,U> {
     fn dummy(&'a self) -> &'a (T,U);
 }
 
-trait Eq<Sized? X> { }
-impl<Sized? X> Eq<X> for X { }
-fn eq<Sized? A,Sized? B:Eq<A>>() { }
+trait Eq<X: ?Sized> { }
+impl<X: ?Sized> Eq<X> for X { }
+fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
 
 fn same_type<A,B:Eq<A>>(a: A, b: B) { }
 
diff --git a/src/test/compile-fail/unsized-bare-typaram.rs b/src/test/compile-fail/unsized-bare-typaram.rs
index 7b5d4295411..2de490e018b 100644
--- a/src/test/compile-fail/unsized-bare-typaram.rs
+++ b/src/test/compile-fail/unsized-bare-typaram.rs
@@ -9,5 +9,5 @@
 // except according to those terms.
 
 fn bar<T: Sized>() { }
-fn foo<Sized? T>() { bar::<T>() } //~ ERROR the trait `core::kinds::Sized` is not implemented
+fn foo<T: ?Sized>() { bar::<T>() } //~ ERROR the trait `core::kinds::Sized` is not implemented
 fn main() { }
diff --git a/src/test/compile-fail/unsized-enum.rs b/src/test/compile-fail/unsized-enum.rs
index 0462a2025d2..aea236c9268 100644
--- a/src/test/compile-fail/unsized-enum.rs
+++ b/src/test/compile-fail/unsized-enum.rs
@@ -10,18 +10,18 @@
 
 
 fn is_sized<T:Sized>() { }
-fn not_sized<Sized? T>() { }
+fn not_sized<T: ?Sized>() { }
 
 enum Foo<U> { FooSome(U), FooNone }
 fn foo1<T>() { not_sized::<Foo<T>>() } // Hunky dory.
-fn foo2<Sized? T>() { not_sized::<Foo<T>>() }
+fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
 //~^ ERROR the trait `core::kinds::Sized` is not implemented
 //
 // Not OK: `T` is not sized.
 
-enum Bar<Sized? U> { BarSome(U), BarNone }
-fn bar1<Sized? T>() { not_sized::<Bar<T>>() }
-fn bar2<Sized? T>() { is_sized::<Bar<T>>() }
+enum Bar<U: ?Sized> { BarSome(U), BarNone }
+fn bar1<T: ?Sized>() { not_sized::<Bar<T>>() }
+fn bar2<T: ?Sized>() { is_sized::<Bar<T>>() }
 //~^ ERROR the trait `core::kinds::Sized` is not implemented
 //
 // Not OK: `Bar<T>` is not sized, but it should be.
diff --git a/src/test/compile-fail/unsized-inherent-impl-self-type.rs b/src/test/compile-fail/unsized-inherent-impl-self-type.rs
index 2c8a2b361d5..8740346a217 100644
--- a/src/test/compile-fail/unsized-inherent-impl-self-type.rs
+++ b/src/test/compile-fail/unsized-inherent-impl-self-type.rs
@@ -14,7 +14,7 @@
 
 struct S5<Y>;
 
-impl<Sized? X> S5<X> { //~ ERROR not implemented
+impl<X: ?Sized> S5<X> { //~ ERROR not implemented
 }
 
 fn main() { }
diff --git a/src/test/compile-fail/unsized-struct.rs b/src/test/compile-fail/unsized-struct.rs
index db2e9cb9328..89c71103697 100644
--- a/src/test/compile-fail/unsized-struct.rs
+++ b/src/test/compile-fail/unsized-struct.rs
@@ -10,18 +10,18 @@
 
 
 fn is_sized<T:Sized>() { }
-fn not_sized<Sized? T>() { }
+fn not_sized<T: ?Sized>() { }
 
 struct Foo<T> { data: T }
 fn foo1<T>() { not_sized::<Foo<T>>() } // Hunky dory.
-fn foo2<Sized? T>() { not_sized::<Foo<T>>() }
+fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
 //~^ ERROR the trait `core::kinds::Sized` is not implemented
 //
 // Not OK: `T` is not sized.
 
-struct Bar<Sized? T> { data: T }
-fn bar1<Sized? T>() { not_sized::<Bar<T>>() }
-fn bar2<Sized? T>() { is_sized::<Bar<T>>() }
+struct Bar<T: ?Sized> { data: T }
+fn bar1<T: ?Sized>() { not_sized::<Bar<T>>() }
+fn bar2<T: ?Sized>() { is_sized::<Bar<T>>() }
 //~^ ERROR the trait `core::kinds::Sized` is not implemented
 //
 // Not OK: `Bar<T>` is not sized, but it should be.
diff --git a/src/test/compile-fail/unsized-trait-impl-self-type.rs b/src/test/compile-fail/unsized-trait-impl-self-type.rs
index 0f0a97fab4d..3dd55b0ba7d 100644
--- a/src/test/compile-fail/unsized-trait-impl-self-type.rs
+++ b/src/test/compile-fail/unsized-trait-impl-self-type.rs
@@ -11,12 +11,12 @@
 // Test sized-ness checking in substitution in impls.
 
 // impl - struct
-trait T3<Sized? Z> {
+trait T3<Z: ?Sized> {
 }
 
 struct S5<Y>;
 
-impl<Sized? X> T3<X> for S5<X> { //~ ERROR not implemented
+impl<X: ?Sized> T3<X> for S5<X> { //~ ERROR not implemented
 }
 
 fn main() { }
diff --git a/src/test/compile-fail/unsized-trait-impl-trait-arg.rs b/src/test/compile-fail/unsized-trait-impl-trait-arg.rs
index bdb652b168a..7ae74fc2600 100644
--- a/src/test/compile-fail/unsized-trait-impl-trait-arg.rs
+++ b/src/test/compile-fail/unsized-trait-impl-trait-arg.rs
@@ -13,8 +13,8 @@
 // impl - unbounded
 trait T2<Z> {
 }
-struct S4<Sized? Y>;
-impl<Sized? X> T2<X> for S4<X> {
+struct S4<Y: ?Sized>;
+impl<X: ?Sized> T2<X> for S4<X> {
     //~^ ERROR `core::kinds::Sized` is not implemented for the type `X`
 }
 
diff --git a/src/test/compile-fail/unsized3.rs b/src/test/compile-fail/unsized3.rs
index 76a6f01b183..1b0368a351a 100644
--- a/src/test/compile-fail/unsized3.rs
+++ b/src/test/compile-fail/unsized3.rs
@@ -12,7 +12,7 @@
 
 
 // Unbounded.
-fn f1<Sized? X>(x: &X) {
+fn f1<X: ?Sized>(x: &X) {
     f2::<X>(x);
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
 }
@@ -20,8 +20,8 @@ fn f2<X>(x: &X) {
 }
 
 // Bounded.
-trait T {}
-fn f3<Sized? X: T>(x: &X) {
+trait T for {}
+fn f3<X: ?Sized + T>(x: &X) {
     f4::<X>(x);
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
 }
@@ -29,13 +29,13 @@ fn f4<X: T>(x: &X) {
 }
 
 // Test with unsized enum.
-enum E<Sized? X> {
+enum E<X: ?Sized> {
     V(X),
 }
 
 fn f5<Y>(x: &Y) {}
-fn f6<Sized? X>(x: &X) {}
-fn f7<Sized? X>(x1: &E<X>, x2: &E<X>) {
+fn f6<X: ?Sized>(x: &X) {}
+fn f7<X: ?Sized>(x1: &E<X>, x2: &E<X>) {
     f5(x1);
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
     f6(x2); // ok
@@ -43,23 +43,23 @@ fn f7<Sized? X>(x1: &E<X>, x2: &E<X>) {
 
 
 // Test with unsized struct.
-struct S<Sized? X> {
+struct S<X: ?Sized> {
     x: X,
 }
 
-fn f8<Sized? X>(x1: &S<X>, x2: &S<X>) {
+fn f8<X: ?Sized>(x1: &S<X>, x2: &S<X>) {
     f5(x1);
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
     f6(x2); // ok
 }
 
 // Test some tuples.
-fn f9<Sized? X>(x1: Box<S<X>>, x2: Box<E<X>>) {
+fn f9<X: ?Sized>(x1: Box<S<X>>, x2: Box<E<X>>) {
     f5(&(*x1, 34i));
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
 }
 
-fn f10<Sized? X>(x1: Box<S<X>>, x2: Box<E<X>>) {
+fn f10<X: ?Sized>(x1: Box<S<X>>, x2: Box<E<X>>) {
     f5(&(32i, *x2));
     //~^ ERROR the trait `core::kinds::Sized` is not implemented
 }
diff --git a/src/test/compile-fail/unsized4.rs b/src/test/compile-fail/unsized4.rs
index f9ece8e6843..f8b8ad2bf2e 100644
--- a/src/test/compile-fail/unsized4.rs
+++ b/src/test/compile-fail/unsized4.rs
@@ -11,7 +11,7 @@
 // Test that bounds are sized-compatible.
 
 trait T : Sized {}
-fn f<Sized? Y: T>() {
+fn f<Y: ?Sized + T>() {
 //~^ERROR incompatible bounds on `Y`, bound `T` does not allow unsized type
 }
 
diff --git a/src/test/compile-fail/unsized5.rs b/src/test/compile-fail/unsized5.rs
index d9d7a86889f..f7477d746fa 100644
--- a/src/test/compile-fail/unsized5.rs
+++ b/src/test/compile-fail/unsized5.rs
@@ -10,11 +10,11 @@
 
 // Test `Sized?` types not allowed in fields (except the last one).
 
-struct S1<Sized? X> {
+struct S1<X: ?Sized> {
     f1: X, //~ ERROR `core::kinds::Sized` is not implemented
     f2: int,
 }
-struct S2<Sized? X> {
+struct S2<X: ?Sized> {
     f: int,
     g: X, //~ ERROR `core::kinds::Sized` is not implemented
     h: int,
@@ -27,10 +27,10 @@ struct S4 {
     f: str, //~ ERROR `core::kinds::Sized` is not implemented
     g: uint
 }
-enum E<Sized? X> {
+enum E<X: ?Sized> {
     V1(X, int), //~ERROR `core::kinds::Sized` is not implemented
 }
-enum F<Sized? X> {
+enum F<X: ?Sized> {
     V2{f1: X, f: int}, //~ERROR `core::kinds::Sized` is not implemented
 }
 
diff --git a/src/test/compile-fail/unsized6.rs b/src/test/compile-fail/unsized6.rs
index 4fcf7707f07..b4f0a4912cf 100644
--- a/src/test/compile-fail/unsized6.rs
+++ b/src/test/compile-fail/unsized6.rs
@@ -13,30 +13,30 @@
 
 trait T {}
 
-fn f1<Sized? X>(x: &X) {
+fn f1<X: ?Sized>(x: &X) {
     let _: X; // <-- this is OK, no bindings created, no initializer.
     let _: (int, (X, int)); // same
     let y: X; //~ERROR the trait `core::kinds::Sized` is not implemented
     let y: (int, (X, int)); //~ERROR the trait `core::kinds::Sized` is not implemented
 }
-fn f2<Sized? X: T>(x: &X) {
+fn f2<X: ?Sized + T>(x: &X) {
     let y: X; //~ERROR the trait `core::kinds::Sized` is not implemented
     let y: (int, (X, int)); //~ERROR the trait `core::kinds::Sized` is not implemented
 }
 
-fn f3<Sized? X>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
+fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
     let y: X = *x1; //~ERROR the trait `core::kinds::Sized` is not implemented
     let y = *x2; //~ERROR the trait `core::kinds::Sized` is not implemented
     let (y, z) = (*x3, 4i); //~ERROR the trait `core::kinds::Sized` is not implemented
 }
-fn f4<Sized? X: T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
+fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
     let y: X = *x1;         //~ERROR the trait `core::kinds::Sized` is not implemented
     let y = *x2;            //~ERROR the trait `core::kinds::Sized` is not implemented
     let (y, z) = (*x3, 4i); //~ERROR the trait `core::kinds::Sized` is not implemented
 }
 
-fn g1<Sized? X>(x: X) {} //~ERROR the trait `core::kinds::Sized` is not implemented
-fn g2<Sized? X: T>(x: X) {} //~ERROR the trait `core::kinds::Sized` is not implemented
+fn g1<X: ?Sized>(x: X) {} //~ERROR the trait `core::kinds::Sized` is not implemented
+fn g2<X: ?Sized + T>(x: X) {} //~ERROR the trait `core::kinds::Sized` is not implemented
 
 pub fn main() {
 }
diff --git a/src/test/compile-fail/unsized7.rs b/src/test/compile-fail/unsized7.rs
index e919f049713..8a54771112f 100644
--- a/src/test/compile-fail/unsized7.rs
+++ b/src/test/compile-fail/unsized7.rs
@@ -16,8 +16,8 @@ trait T {}
 // impl - bounded
 trait T1<Z: T> {
 }
-struct S3<Sized? Y>;
-impl<Sized? X: T> T1<X> for S3<X> {
+struct S3<Y: ?Sized>;
+impl<X: ?Sized + T> T1<X> for S3<X> {
     //~^ ERROR `core::kinds::Sized` is not implemented for the type `X`
 }
 
diff --git a/src/test/run-pass-valgrind/dst-dtor-1.rs b/src/test/run-pass-valgrind/dst-dtor-1.rs
index 6e2ae117ce7..8b8b7f169c5 100644
--- a/src/test/run-pass-valgrind/dst-dtor-1.rs
+++ b/src/test/run-pass-valgrind/dst-dtor-1.rs
@@ -20,7 +20,7 @@ impl Drop for Foo {
 trait Trait {}
 impl Trait for Foo {}
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     f: T
 }
 
diff --git a/src/test/run-pass-valgrind/dst-dtor-2.rs b/src/test/run-pass-valgrind/dst-dtor-2.rs
index deaf49228bc..743293c23f6 100644
--- a/src/test/run-pass-valgrind/dst-dtor-2.rs
+++ b/src/test/run-pass-valgrind/dst-dtor-2.rs
@@ -17,7 +17,7 @@ impl Drop for Foo {
     }
 }
 
-struct Fat<Sized? T> {
+struct Fat<T: ?Sized> {
     f: T
 }
 
diff --git a/src/test/run-pass/associated-types-conditional-dispatch.rs b/src/test/run-pass/associated-types-conditional-dispatch.rs
index 573f76766fa..6d59161ff93 100644
--- a/src/test/run-pass/associated-types-conditional-dispatch.rs
+++ b/src/test/run-pass/associated-types-conditional-dispatch.rs
@@ -16,7 +16,7 @@
 
 use std::ops::Deref;
 
-pub trait MyEq<Sized? U=Self> {
+pub trait MyEq<U: ?Sized=Self> {
     fn eq(&self, u: &U) -> bool;
 }
 
diff --git a/src/test/run-pass/issue-18906.rs b/src/test/run-pass/issue-18906.rs
index e82359bc168..11ffb4198da 100644
--- a/src/test/run-pass/issue-18906.rs
+++ b/src/test/run-pass/issue-18906.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait Borrow<Sized? Borrowed> {
+pub trait Borrow<Borrowed: ?Sized> {
         fn borrow(&self) -> &Borrowed;
 }