Fix a few impl stability attributes

The versions show up in rustdoc.

28 files changed, 116 insertions, 93 deletions

diff --git a/src/libcollections/binary_heap.rs b/src/libcollections/binary_heap.rs
index b7c2a708baf..23e0295ba54 100644
--- a/src/libcollections/binary_heap.rs
+++ b/src/libcollections/binary_heap.rs
@@ -1088,7 +1088,7 @@ impl<'a, T: 'a> ExactSizeIterator for Drain<'a, T> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, T: 'a> FusedIterator for Drain<'a, T> {}
 
-#[stable(feature = "rust1", since = "1.0.0")]
+#[stable(feature = "binary_heap_extras_15", since = "1.5.0")]
 impl<T: Ord> From<Vec<T>> for BinaryHeap<T> {
     fn from(vec: Vec<T>) -> BinaryHeap<T> {
         let mut heap = BinaryHeap { data: vec };
@@ -1097,7 +1097,7 @@ impl<T: Ord> From<Vec<T>> for BinaryHeap<T> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
+#[stable(feature = "binary_heap_extras_15", since = "1.5.0")]
 impl<T> From<BinaryHeap<T>> for Vec<T> {
     fn from(heap: BinaryHeap<T>) -> Vec<T> {
         heap.data
diff --git a/src/libcore/char.rs b/src/libcore/char.rs
index 367422f5536..78764091cf0 100644
--- a/src/libcore/char.rs
+++ b/src/libcore/char.rs
@@ -588,7 +588,7 @@ impl ExactSizeIterator for EscapeUnicode {
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeUnicode {}
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
+#[stable(feature = "char_struct_display", since = "1.16.0")]
 impl fmt::Display for EscapeUnicode {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         for c in self.clone() {
@@ -701,7 +701,7 @@ impl ExactSizeIterator for EscapeDefault {
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeDefault {}
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
+#[stable(feature = "char_struct_display", since = "1.16.0")]
 impl fmt::Display for EscapeDefault {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         for c in self.clone() {
@@ -735,7 +735,7 @@ impl ExactSizeIterator for EscapeDebug { }
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeDebug {}
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
+#[unstable(feature = "char_escape_debug", issue = "35068")]
 impl fmt::Display for EscapeDebug {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(&self.0, f)
diff --git a/src/libcore/internal_macros.rs b/src/libcore/internal_macros.rs
index f2cdc9d6a98..9a7914064fd 100644
--- a/src/libcore/internal_macros.rs
+++ b/src/libcore/internal_macros.rs
@@ -13,7 +13,11 @@
 // based on "op T" where T is expected to be `Copy`able
 macro_rules! forward_ref_unop {
     (impl $imp:ident, $method:ident for $t:ty) => {
-        #[stable(feature = "rust1", since = "1.0.0")]
+        forward_ref_unop!(impl $imp, $method for $t,
+                #[stable(feature = "rust1", since = "1.0.0")]);
+    };
+    (impl $imp:ident, $method:ident for $t:ty, #[$attr:meta]) => {
+        #[$attr]
         impl<'a> $imp for &'a $t {
             type Output = <$t as $imp>::Output;
 
@@ -29,7 +33,11 @@ macro_rules! forward_ref_unop {
 // based on "T op U" where T and U are expected to be `Copy`able
 macro_rules! forward_ref_binop {
     (impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
-        #[stable(feature = "rust1", since = "1.0.0")]
+        forward_ref_binop!(impl $imp, $method for $t, $u,
+                #[stable(feature = "rust1", since = "1.0.0")]);
+    };
+    (impl $imp:ident, $method:ident for $t:ty, $u:ty, #[$attr:meta]) => {
+        #[$attr]
         impl<'a> $imp<$u> for &'a $t {
             type Output = <$t as $imp<$u>>::Output;
 
@@ -39,7 +47,7 @@ macro_rules! forward_ref_binop {
             }
         }
 
-        #[stable(feature = "rust1", since = "1.0.0")]
+        #[$attr]
         impl<'a> $imp<&'a $u> for $t {
             type Output = <$t as $imp<$u>>::Output;
 
@@ -49,7 +57,7 @@ macro_rules! forward_ref_binop {
             }
         }
 
-        #[stable(feature = "rust1", since = "1.0.0")]
+        #[$attr]
         impl<'a, 'b> $imp<&'a $u> for &'b $t {
             type Output = <$t as $imp<$u>>::Output;
 
diff --git a/src/libcore/iter/traits.rs b/src/libcore/iter/traits.rs
index 1e127148300..3e8d0600e19 100644
--- a/src/libcore/iter/traits.rs
+++ b/src/libcore/iter/traits.rs
@@ -603,29 +603,29 @@ pub trait Product<A = Self>: Sized {
 
 // NB: explicitly use Add and Mul here to inherit overflow checks
 macro_rules! integer_sum_product {
-    (@impls $zero:expr, $one:expr, $($a:ty)*) => ($(
-        #[stable(feature = "iter_arith_traits", since = "1.12.0")]
+    (@impls $zero:expr, $one:expr, #[$attr:meta], $($a:ty)*) => ($(
+        #[$attr]
         impl Sum for $a {
             fn sum<I: Iterator<Item=$a>>(iter: I) -> $a {
                 iter.fold($zero, Add::add)
             }
         }
 
-        #[stable(feature = "iter_arith_traits", since = "1.12.0")]
+        #[$attr]
         impl Product for $a {
             fn product<I: Iterator<Item=$a>>(iter: I) -> $a {
                 iter.fold($one, Mul::mul)
             }
         }
 
-        #[stable(feature = "iter_arith_traits", since = "1.12.0")]
+        #[$attr]
         impl<'a> Sum<&'a $a> for $a {
             fn sum<I: Iterator<Item=&'a $a>>(iter: I) -> $a {
                 iter.fold($zero, Add::add)
             }
         }
 
-        #[stable(feature = "iter_arith_traits", since = "1.12.0")]
+        #[$attr]
         impl<'a> Product<&'a $a> for $a {
             fn product<I: Iterator<Item=&'a $a>>(iter: I) -> $a {
                 iter.fold($one, Mul::mul)
@@ -633,8 +633,12 @@ macro_rules! integer_sum_product {
         }
     )*);
     ($($a:ty)*) => (
-        integer_sum_product!(@impls 0, 1, $($a)+);
-        integer_sum_product!(@impls Wrapping(0), Wrapping(1), $(Wrapping<$a>)+);
+        integer_sum_product!(@impls 0, 1,
+                #[stable(feature = "iter_arith_traits", since = "1.12.0")],
+                $($a)+);
+        integer_sum_product!(@impls Wrapping(0), Wrapping(1),
+                #[stable(feature = "wrapping_iter_arith", since = "1.14.0")],
+                $(Wrapping<$a>)+);
     );
 }
 
diff --git a/src/libcore/num/int_macros.rs b/src/libcore/num/int_macros.rs
index 04311d687ea..3b1612a4ee2 100644
--- a/src/libcore/num/int_macros.rs
+++ b/src/libcore/num/int_macros.rs
@@ -12,12 +12,12 @@
 
 macro_rules! int_module {
     ($T:ident) => (int_module!($T, #[stable(feature = "rust1", since = "1.0.0")]););
-    ($T:ident, $($attr: tt)*) => (
+    ($T:ident, #[$attr:meta]) => (
         /// The smallest value that can be represented by this integer type.
-        $($attr)*
+        #[$attr]
         pub const MIN: $T = $T::min_value();
         /// The largest value that can be represented by this integer type.
-        $($attr)*
+        #[$attr]
         pub const MAX: $T = $T::max_value();
     )
 }
diff --git a/src/libcore/num/uint_macros.rs b/src/libcore/num/uint_macros.rs
index 2e59b39278a..f7e1f78d69e 100644
--- a/src/libcore/num/uint_macros.rs
+++ b/src/libcore/num/uint_macros.rs
@@ -12,12 +12,12 @@
 
 macro_rules! uint_module {
     ($T:ident) => (uint_module!($T, #[stable(feature = "rust1", since = "1.0.0")]););
-    ($T:ident, $($attr: tt)*) => (
+    ($T:ident, #[$attr:meta]) => (
         /// The smallest value that can be represented by this integer type.
-        $($attr)*
+        #[$attr]
         pub const MIN: $T = $T::min_value();
         /// The largest value that can be represented by this integer type.
-        $($attr)*
+        #[$attr]
         pub const MAX: $T = $T::max_value();
     )
 }
diff --git a/src/libcore/num/wrapping.rs b/src/libcore/num/wrapping.rs
index b3c2c25551e..5d9e6ab1294 100644
--- a/src/libcore/num/wrapping.rs
+++ b/src/libcore/num/wrapping.rs
@@ -131,7 +131,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0.wrapping_add(other.0))
             }
         }
-        forward_ref_binop! { impl Add, add for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl Add, add for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl AddAssign for Wrapping<$t> {
@@ -150,7 +151,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0.wrapping_sub(other.0))
             }
         }
-        forward_ref_binop! { impl Sub, sub for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl Sub, sub for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl SubAssign for Wrapping<$t> {
@@ -169,7 +171,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0.wrapping_mul(other.0))
             }
         }
-        forward_ref_binop! { impl Mul, mul for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl Mul, mul for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl MulAssign for Wrapping<$t> {
@@ -188,7 +191,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0.wrapping_div(other.0))
             }
         }
-        forward_ref_binop! { impl Div, div for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl Div, div for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl DivAssign for Wrapping<$t> {
@@ -207,7 +211,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0.wrapping_rem(other.0))
             }
         }
-        forward_ref_binop! { impl Rem, rem for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl Rem, rem for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl RemAssign for Wrapping<$t> {
@@ -226,7 +231,8 @@ macro_rules! wrapping_impl {
                 Wrapping(!self.0)
             }
         }
-        forward_ref_unop! { impl Not, not for Wrapping<$t> }
+        forward_ref_unop! { impl Not, not for Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "rust1", since = "1.0.0")]
         impl BitXor for Wrapping<$t> {
@@ -237,7 +243,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0 ^ other.0)
             }
         }
-        forward_ref_binop! { impl BitXor, bitxor for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl BitXor, bitxor for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl BitXorAssign for Wrapping<$t> {
@@ -256,7 +263,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0 | other.0)
             }
         }
-        forward_ref_binop! { impl BitOr, bitor for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl BitOr, bitor for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl BitOrAssign for Wrapping<$t> {
@@ -275,7 +283,8 @@ macro_rules! wrapping_impl {
                 Wrapping(self.0 & other.0)
             }
         }
-        forward_ref_binop! { impl BitAnd, bitand for Wrapping<$t>, Wrapping<$t> }
+        forward_ref_binop! { impl BitAnd, bitand for Wrapping<$t>, Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
 
         #[stable(feature = "op_assign_traits", since = "1.8.0")]
         impl BitAndAssign for Wrapping<$t> {
@@ -293,7 +302,8 @@ macro_rules! wrapping_impl {
                 Wrapping(0) - self
             }
         }
-        forward_ref_unop! { impl Neg, neg for Wrapping<$t> }
+        forward_ref_unop! { impl Neg, neg for Wrapping<$t>,
+                #[stable(feature = "wrapping_ref", since = "1.14.0")] }
     )*)
 }
 
diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index b942d85f980..1a482b75731 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -616,7 +616,7 @@ pub trait SliceIndex<T> {
     fn index_mut(self, slice: &mut [T]) -> &mut Self::Output;
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[stable(feature = "slice-get-slice-impls", since = "1.15.0")]
 impl<T> SliceIndex<T> for usize {
     type Output = T;
 
@@ -665,7 +665,7 @@ impl<T> SliceIndex<T> for usize {
     }
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[stable(feature = "slice-get-slice-impls", since = "1.15.0")]
 impl<T> SliceIndex<T> for  ops::Range<usize> {
     type Output = [T];
 
@@ -726,7 +726,7 @@ impl<T> SliceIndex<T> for  ops::Range<usize> {
     }
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[stable(feature = "slice-get-slice-impls", since = "1.15.0")]
 impl<T> SliceIndex<T> for ops::RangeTo<usize> {
     type Output = [T];
 
@@ -761,7 +761,7 @@ impl<T> SliceIndex<T> for ops::RangeTo<usize> {
     }
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[stable(feature = "slice-get-slice-impls", since = "1.15.0")]
 impl<T> SliceIndex<T> for ops::RangeFrom<usize> {
     type Output = [T];
 
@@ -796,7 +796,7 @@ impl<T> SliceIndex<T> for ops::RangeFrom<usize> {
     }
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[stable(feature = "slice-get-slice-impls", since = "1.15.0")]
 impl<T> SliceIndex<T> for ops::RangeFull {
     type Output = [T];
 
@@ -832,7 +832,7 @@ impl<T> SliceIndex<T> for ops::RangeFull {
 }
 
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
 impl<T> SliceIndex<T> for ops::RangeInclusive<usize> {
     type Output = [T];
 
@@ -895,7 +895,7 @@ impl<T> SliceIndex<T> for ops::RangeInclusive<usize> {
     }
 }
 
-#[stable(feature = "slice-get-slice-impls", since = "1.13.0")]
+#[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
 impl<T> SliceIndex<T> for ops::RangeToInclusive<usize> {
     type Output = [T];
 
diff --git a/src/libstd/ascii.rs b/src/libstd/ascii.rs
index b220504d2b4..35c388ba076 100644
--- a/src/libstd/ascii.rs
+++ b/src/libstd/ascii.rs
@@ -399,7 +399,7 @@ impl ExactSizeIterator for EscapeDefault {}
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeDefault {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for EscapeDefault {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("EscapeDefault { .. }")
diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
index a314717a877..2a4826f8045 100644
--- a/src/libstd/collections/hash/map.rs
+++ b/src/libstd/collections/hash/map.rs
@@ -1276,7 +1276,7 @@ impl<'a, K, V> Clone for Iter<'a, K, V> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: Debug, V: Debug> fmt::Debug for Iter<'a, K, V> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_list()
@@ -1311,7 +1311,7 @@ impl<'a, K, V> Clone for Keys<'a, K, V> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: Debug, V: Debug> fmt::Debug for Keys<'a, K, V> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_list()
@@ -1334,7 +1334,7 @@ impl<'a, K, V> Clone for Values<'a, K, V> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: Debug, V: Debug> fmt::Debug for Values<'a, K, V> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_list()
@@ -1584,7 +1584,7 @@ impl<'a, K, V> ExactSizeIterator for IterMut<'a, K, V> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, K, V> FusedIterator for IterMut<'a, K, V> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K, V> fmt::Debug for IterMut<'a, K, V>
     where K: fmt::Debug,
           V: fmt::Debug,
@@ -1619,7 +1619,7 @@ impl<K, V> ExactSizeIterator for IntoIter<K, V> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<K, V> FusedIterator for IntoIter<K, V> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<K: Debug, V: Debug> fmt::Debug for IntoIter<K, V> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_list()
@@ -1697,7 +1697,7 @@ impl<'a, K, V> ExactSizeIterator for ValuesMut<'a, K, V> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, K, V> FusedIterator for ValuesMut<'a, K, V> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K, V> fmt::Debug for ValuesMut<'a, K, V>
     where K: fmt::Debug,
           V: fmt::Debug,
@@ -1732,7 +1732,7 @@ impl<'a, K, V> ExactSizeIterator for Drain<'a, K, V> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, K, V> FusedIterator for Drain<'a, K, V> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K, V> fmt::Debug for Drain<'a, K, V>
     where K: fmt::Debug,
           V: fmt::Debug,
@@ -2220,7 +2220,7 @@ impl Default for RandomState {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for RandomState {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("RandomState { .. }")
diff --git a/src/libstd/collections/hash/set.rs b/src/libstd/collections/hash/set.rs
index 341b050862f..a3f7e13bbf9 100644
--- a/src/libstd/collections/hash/set.rs
+++ b/src/libstd/collections/hash/set.rs
@@ -948,7 +948,7 @@ impl<'a, K> ExactSizeIterator for Iter<'a, K> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, K> FusedIterator for Iter<'a, K> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: fmt::Debug> fmt::Debug for Iter<'a, K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_list()
@@ -977,7 +977,7 @@ impl<K> ExactSizeIterator for IntoIter<K> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<K> FusedIterator for IntoIter<K> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<K: fmt::Debug> fmt::Debug for IntoIter<K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let entries_iter = self.iter.inner.iter().map(|(k, _)| k);
@@ -1007,7 +1007,7 @@ impl<'a, K> ExactSizeIterator for Drain<'a, K> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, K> FusedIterator for Drain<'a, K> {}
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: fmt::Debug> fmt::Debug for Drain<'a, K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let entries_iter = self.iter.inner.iter().map(|(k, _)| k);
@@ -1050,7 +1050,7 @@ impl<'a, T, S> Iterator for Intersection<'a, T, S>
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Intersection<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
           S: BuildHasher,
@@ -1109,7 +1109,7 @@ impl<'a, T, S> FusedIterator for Difference<'a, T, S>
 {
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Difference<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
           S: BuildHasher,
@@ -1150,7 +1150,7 @@ impl<'a, T, S> FusedIterator for SymmetricDifference<'a, T, S>
 {
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for SymmetricDifference<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
           S: BuildHasher,
@@ -1176,7 +1176,7 @@ impl<'a, T, S> FusedIterator for Union<'a, T, S>
 {
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Union<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
           S: BuildHasher,
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index c3a6b2433ed..29f2ac6ab44 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -145,7 +145,7 @@ impl Iterator for Vars {
     fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Vars {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Vars { .. }")
@@ -159,7 +159,7 @@ impl Iterator for VarsOs {
     fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for VarsOs {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("VarsOs { .. }")
@@ -382,7 +382,7 @@ impl<'a> Iterator for SplitPaths<'a> {
     fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a> fmt::Debug for SplitPaths<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("SplitPaths { .. }")
@@ -665,7 +665,7 @@ impl DoubleEndedIterator for Args {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Args {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Args { .. }")
@@ -690,7 +690,7 @@ impl DoubleEndedIterator for ArgsOs {
     fn next_back(&mut self) -> Option<OsString> { self.inner.next_back() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ArgsOs {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("ArgsOs { .. }")
diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index 249627c430c..e5562d05f10 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -869,7 +869,7 @@ impl Metadata {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Metadata {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Metadata")
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index de5fc5bfad1..8cb7b2bda75 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1450,7 +1450,7 @@ pub struct Chain<T, U> {
     done_first: bool,
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<T: fmt::Debug, U: fmt::Debug> fmt::Debug for Chain<T, U> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Chain")
diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index 83a675eb512..e16e8019b5f 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -282,7 +282,7 @@ impl Stdin {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Stdin {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Stdin { .. }")
@@ -321,7 +321,7 @@ impl<'a> BufRead for StdinLock<'a> {
     fn consume(&mut self, n: usize) { self.inner.consume(n) }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a> fmt::Debug for StdinLock<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("StdinLock { .. }")
@@ -438,7 +438,7 @@ impl Stdout {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Stdout {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Stdout { .. }")
@@ -470,7 +470,7 @@ impl<'a> Write for StdoutLock<'a> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a> fmt::Debug for StdoutLock<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("StdoutLock { .. }")
@@ -573,7 +573,7 @@ impl Stderr {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Stderr {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Stderr { .. }")
@@ -605,7 +605,7 @@ impl<'a> Write for StderrLock<'a> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a> fmt::Debug for StderrLock<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("StderrLock { .. }")
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index e50665120eb..4163187488e 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -98,7 +98,7 @@ impl BufRead for Empty {
     fn consume(&mut self, _n: usize) {}
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Empty {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Empty { .. }")
@@ -141,7 +141,7 @@ impl Read for Repeat {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Repeat {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Repeat { .. }")
@@ -180,7 +180,7 @@ impl Write for Sink {
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Sink {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Sink { .. }")
diff --git a/src/libstd/net/mod.rs b/src/libstd/net/mod.rs
index 2b60fc38198..b0d2e3e4687 100644
--- a/src/libstd/net/mod.rs
+++ b/src/libstd/net/mod.rs
@@ -106,7 +106,10 @@ impl Iterator for LookupHost {
     fn next(&mut self) -> Option<SocketAddr> { self.0.next() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[unstable(feature = "lookup_host", reason = "unsure about the returned \
+                                              iterator and returning socket \
+                                              addresses",
+           issue = "27705")]
 impl fmt::Debug for LookupHost {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("LookupHost { .. }")
diff --git a/src/libstd/os/raw.rs b/src/libstd/os/raw.rs
index cc154f7ab41..68d4ca90019 100644
--- a/src/libstd/os/raw.rs
+++ b/src/libstd/os/raw.rs
@@ -73,7 +73,7 @@ pub enum c_void {
     #[doc(hidden)] __variant2,
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for c_void {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("c_void")
diff --git a/src/libstd/panic.rs b/src/libstd/panic.rs
index faf4949e861..ac0d0d2afb8 100644
--- a/src/libstd/panic.rs
+++ b/src/libstd/panic.rs
@@ -297,7 +297,7 @@ impl<R, F: FnOnce() -> R> FnOnce<()> for AssertUnwindSafe<F> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<T: fmt::Debug> fmt::Debug for AssertUnwindSafe<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_tuple("AssertUnwindSafe")
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 5af4ba53bf9..e44c01e32a1 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -114,7 +114,7 @@ impl IntoInner<imp::Process> for Child {
     fn into_inner(self) -> imp::Process { self.handle }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Child {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Child")
@@ -160,7 +160,7 @@ impl FromInner<AnonPipe> for ChildStdin {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ChildStdin {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("ChildStdin { .. }")
@@ -201,7 +201,7 @@ impl FromInner<AnonPipe> for ChildStdout {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ChildStdout {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("ChildStdout { .. }")
@@ -242,7 +242,7 @@ impl FromInner<AnonPipe> for ChildStderr {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ChildStderr {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("ChildStderr { .. }")
@@ -696,7 +696,7 @@ impl FromInner<imp::Stdio> for Stdio {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Stdio {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Stdio { .. }")
diff --git a/src/libstd/sync/barrier.rs b/src/libstd/sync/barrier.rs
index b8e83dced8d..fc4fd4ce92b 100644
--- a/src/libstd/sync/barrier.rs
+++ b/src/libstd/sync/barrier.rs
@@ -55,7 +55,7 @@ struct BarrierState {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct BarrierWaitResult(bool);
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Barrier {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Barrier { .. }")
@@ -110,7 +110,7 @@ impl Barrier {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for BarrierWaitResult {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("BarrierWaitResult")
diff --git a/src/libstd/sync/condvar.rs b/src/libstd/sync/condvar.rs
index 8ab30c51b28..d5bfc331c4e 100644
--- a/src/libstd/sync/condvar.rs
+++ b/src/libstd/sync/condvar.rs
@@ -240,7 +240,7 @@ impl Condvar {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Condvar {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Condvar { .. }")
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index 2efddeb4610..0d6ad5e38e9 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -428,7 +428,7 @@ impl<'a, T: ?Sized> Drop for MutexGuard<'a, T> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T: ?Sized + fmt::Debug> fmt::Debug for MutexGuard<'a, T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("MutexGuard")
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index a9747639aac..ba993751391 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -330,7 +330,7 @@ impl Once {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Once {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("Once { .. }")
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index adbb98e4b1f..a3db0adeda0 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -361,7 +361,7 @@ impl<'rwlock, T: ?Sized> RwLockWriteGuard<'rwlock, T> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T: fmt::Debug> fmt::Debug for RwLockReadGuard<'a, T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("RwLockReadGuard")
@@ -370,7 +370,7 @@ impl<'a, T: fmt::Debug> fmt::Debug for RwLockReadGuard<'a, T> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T: fmt::Debug> fmt::Debug for RwLockWriteGuard<'a, T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("RwLockWriteGuard")
diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index 01584979aab..5166ddf8a21 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -99,7 +99,7 @@ pub struct LocalKey<T: 'static> {
     init: fn() -> T,
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<T: 'static> fmt::Debug for LocalKey<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("LocalKey { .. }")
@@ -332,7 +332,6 @@ pub mod os {
         marker: marker::PhantomData<Cell<T>>,
     }
 
-    #[stable(feature = "std_debug", since = "1.15.0")]
     impl<T> fmt::Debug for Key<T> {
         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
             f.pad("Key { .. }")
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 8789006436c..93e320c4522 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -698,7 +698,7 @@ impl ThreadId {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[unstable(feature = "thread_id", issue = "21507")]
 impl fmt::Debug for ThreadId {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("ThreadId { .. }")
@@ -1002,7 +1002,7 @@ impl<T> IntoInner<imp::Thread> for JoinHandle<T> {
     fn into_inner(self) -> imp::Thread { self.0.native.unwrap() }
 }
 
-#[stable(feature = "std_debug", since = "1.15.0")]
+#[stable(feature = "std_debug", since = "1.16.0")]
 impl<T> fmt::Debug for JoinHandle<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.pad("JoinHandle { .. }")
diff --git a/src/libstd_unicode/char.rs b/src/libstd_unicode/char.rs
index f2c53efda17..4269ce8534b 100644
--- a/src/libstd_unicode/char.rs
+++ b/src/libstd_unicode/char.rs
@@ -131,7 +131,6 @@ impl Iterator for CaseMappingIter {
     }
 }
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
 impl fmt::Display for CaseMappingIter {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
@@ -152,14 +151,14 @@ impl fmt::Display for CaseMappingIter {
     }
 }
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
+#[stable(feature = "char_struct_display", since = "1.16.0")]
 impl fmt::Display for ToLowercase {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(&self.0, f)
     }
 }
 
-#[stable(feature = "char_struct_display", since = "1.17.0")]
+#[stable(feature = "char_struct_display", since = "1.16.0")]
 impl fmt::Display for ToUppercase {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(&self.0, f)