Extend linkchecker with anchor checking

This adds checks to ensure that:
* link anchors refer to existing id's on the target page
* id's are unique within an html document
* page redirects are valid

Author: mitaa

src/doc/style/features/traits/generics.md

@@ -27,8 +27,7 @@ explicitly implement to be used by this generic function.
 * _Inference_. Since the type parameters to generic functions can usually be
   inferred, generic functions can help cut down on verbosity in code where
   explicit conversions or other method calls would usually be necessary. See the
-  [overloading/implicits use case](#use-case-limited-overloading-andor-implicit-conversions)
-  below.
+  overloading/implicits use case below.
 * _Precise types_. Because generics give a _name_ to the specific type
   implementing a trait, it is possible to be precise about places where that
   exact type is required or produced. For example, a function
@@ -51,7 +50,7 @@ explicitly implement to be used by this generic function.
   a `Vec<T>` contains elements of a single concrete type (and, indeed, the
   vector representation is specialized to lay these out in line). Sometimes
   heterogeneous collections are useful; see
-  [trait objects](#use-case-trait-objects) below.
+  trait objects below.
 * _Signature verbosity_. Heavy use of generics can bloat function signatures.
   **[Ed. note]** This problem may be mitigated by some language improvements; stay tuned.
 

src/libcore/iter.rs

@@ -434,7 +434,7 @@ pub trait Iterator {
     /// `None`. Once `None` is encountered, `count()` returns the number of
     /// times it called [`next()`].
     ///
-    /// [`next()`]: #method.next
+    /// [`next()`]: #tymethod.next
     ///
     /// # Overflow Behavior
     ///
@@ -497,7 +497,7 @@ pub trait Iterator {
     /// This method will evaluate the iterator `n` times, discarding those elements.
     /// After it does so, it will call [`next()`] and return its value.
     ///
-    /// [`next()`]: #method.next
+    /// [`next()`]: #tymethod.next
     ///
     /// Like most indexing operations, the count starts from zero, so `nth(0)`
     /// returns the first value, `nth(1)` the second, and so on.

src/libstd/io/mod.rs

@@ -1254,7 +1254,7 @@ pub trait BufRead: Read {
     /// longer be returned. As such, this function may do odd things if
     /// `fill_buf` isn't called before calling it.
     ///
-    /// [fillbuf]: #tymethod.fill_buff
+    /// [fillbuf]: #tymethod.fill_buf
     ///
     /// The `amt` must be `<=` the number of bytes in the buffer returned by
     /// `fill_buf`.

src/libstd/lib.rs

@@ -190,7 +190,7 @@
 //! [`thread`]: thread/index.html
 //! [`use std::env`]: env/index.html
 //! [`use`]: ../book/crates-and-modules.html#importing-modules-with-use
-//! [crate root]: ../book/crates-and-modules.html#basic-terminology:-crates-and-modules
+//! [crate root]: ../book/crates-and-modules.html#basic-terminology-crates-and-modules
 //! [crates.io]: https://crates.io
 //! [deref coercions]: ../book/deref-coercions.html
 //! [files]: fs/struct.File.html

src/libstd/net/tcp.rs

@@ -196,7 +196,7 @@ impl TcpStream {
     ///
     /// For more information about this option, see [`set_nodelay`][link].
     ///
-    /// [link]: #tymethod.set_nodelay
+    /// [link]: #method.set_nodelay
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn nodelay(&self) -> io::Result<bool> {
         self.0.nodelay()
@@ -215,7 +215,7 @@ impl TcpStream {
     ///
     /// For more information about this option, see [`set_ttl`][link].
     ///
-    /// [link]: #tymethod.set_ttl
+    /// [link]: #method.set_ttl
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn ttl(&self) -> io::Result<u32> {
         self.0.ttl()
@@ -238,7 +238,7 @@ impl TcpStream {
     ///
     /// For more information about this option, see [`set_only_v6`][link].
     ///
-    /// [link]: #tymethod.set_only_v6
+    /// [link]: #method.set_only_v6
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn only_v6(&self) -> io::Result<bool> {
         self.0.only_v6()
@@ -374,7 +374,7 @@ impl TcpListener {
     ///
     /// For more information about this option, see [`set_ttl`][link].
     ///
-    /// [link]: #tymethod.set_ttl
+    /// [link]: #method.set_ttl
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn ttl(&self) -> io::Result<u32> {
         self.0.ttl()
@@ -397,7 +397,7 @@ impl TcpListener {
     ///
     /// For more information about this option, see [`set_only_v6`][link].
     ///
-    /// [link]: #tymethod.set_only_v6
+    /// [link]: #method.set_only_v6
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn only_v6(&self) -> io::Result<bool> {
         self.0.only_v6()

src/libstd/net/udp.rs

@@ -155,7 +155,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`set_broadcast`][link].
     ///
-    /// [link]: #tymethod.set_broadcast
+    /// [link]: #method.set_broadcast
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn broadcast(&self) -> io::Result<bool> {
         self.0.broadcast()
@@ -175,7 +175,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`set_multicast_loop_v4`][link].
     ///
-    /// [link]: #tymethod.set_multicast_loop_v4
+    /// [link]: #method.set_multicast_loop_v4
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn multicast_loop_v4(&self) -> io::Result<bool> {
         self.0.multicast_loop_v4()
@@ -198,7 +198,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`set_multicast_ttl_v4`][link].
     ///
-    /// [link]: #tymethod.set_multicast_ttl_v4
+    /// [link]: #method.set_multicast_ttl_v4
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
         self.0.multicast_ttl_v4()
@@ -218,7 +218,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`set_multicast_loop_v6`][link].
     ///
-    /// [link]: #tymethod.set_multicast_loop_v6
+    /// [link]: #method.set_multicast_loop_v6
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn multicast_loop_v6(&self) -> io::Result<bool> {
         self.0.multicast_loop_v6()
@@ -237,7 +237,7 @@ impl UdpSocket {
     ///
     /// For more information about this option, see [`set_ttl`][link].
     ///
-    /// [link]: #tymethod.set_ttl
+    /// [link]: #method.set_ttl
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn ttl(&self) -> io::Result<u32> {
         self.0.ttl()
@@ -260,7 +260,7 @@ impl UdpSocket {
     ///
     /// For more information about this option, see [`set_only_v6`][link].
     ///
-    /// [link]: #tymethod.set_only_v6
+    /// [link]: #method.set_only_v6
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn only_v6(&self) -> io::Result<bool> {
         self.0.only_v6()
@@ -293,7 +293,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`join_multicast_v4`][link].
     ///
-    /// [link]: #tymethod.join_multicast_v4
+    /// [link]: #method.join_multicast_v4
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn leave_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
         self.0.leave_multicast_v4(multiaddr, interface)
@@ -304,7 +304,7 @@ impl UdpSocket {
     /// For more information about this option, see
     /// [`join_multicast_v6`][link].
     ///
-    /// [link]: #tymethod.join_multicast_v6
+    /// [link]: #method.join_multicast_v6
     #[stable(feature = "net2_mutators", since = "1.9.0")]
     pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
         self.0.leave_multicast_v6(multiaddr, interface)