Some tweaks

.gitignore

@@ -1,2 +1,7 @@
 *.html
 book
+
+# linkcheck stuff
+linkcheck
+linkchecker
+linkcheck.sh

src/SUMMARY.md

@@ -3,58 +3,58 @@
 [Introduction](README.md)
 
 * [Meet Safe and Unsafe](meet-safe-and-unsafe.md)
-	* [How Safe and Unsafe Interact](safe-unsafe-meaning.md)
-	* [What Unsafe Can Do](what-unsafe-does.md)
-	* [Working with Unsafe](working-with-unsafe.md)
+    * [How Safe and Unsafe Interact](safe-unsafe-meaning.md)
+    * [What Unsafe Can Do](what-unsafe-does.md)
+    * [Working with Unsafe](working-with-unsafe.md)
 * [Data Layout](data.md)
-	* [repr(Rust)](repr-rust.md)
-	* [Exotically Sized Types](exotic-sizes.md)
-	* [Other reprs](other-reprs.md)
+    * [repr(Rust)](repr-rust.md)
+    * [Exotically Sized Types](exotic-sizes.md)
+    * [Other reprs](other-reprs.md)
 * [Ownership](ownership.md)
-	* [References](references.md)
-	* [Aliasing](aliasing.md)
-	* [Lifetimes](lifetimes.md)
-	* [Limits of Lifetimes](lifetime-mismatch.md)
-	* [Lifetime Elision](lifetime-elision.md)
-	* [Unbounded Lifetimes](unbounded-lifetimes.md)
-	* [Higher-Rank Trait Bounds](hrtb.md)
-	* [Subtyping and Variance](subtyping.md)
-	* [Drop Check](dropck.md)
-	* [PhantomData](phantom-data.md)
-	* [Splitting Borrows](borrow-splitting.md)
+    * [References](references.md)
+    * [Aliasing](aliasing.md)
+    * [Lifetimes](lifetimes.md)
+    * [Limits of Lifetimes](lifetime-mismatch.md)
+    * [Lifetime Elision](lifetime-elision.md)
+    * [Unbounded Lifetimes](unbounded-lifetimes.md)
+    * [Higher-Rank Trait Bounds](hrtb.md)
+    * [Subtyping and Variance](subtyping.md)
+    * [Drop Check](dropck.md)
+    * [PhantomData](phantom-data.md)
+    * [Splitting Borrows](borrow-splitting.md)
 * [Type Conversions](conversions.md)
-	* [Coercions](coercions.md)
-	* [The Dot Operator](dot-operator.md)
-	* [Casts](casts.md)
-	* [Transmutes](transmutes.md)
+    * [Coercions](coercions.md)
+    * [The Dot Operator](dot-operator.md)
+    * [Casts](casts.md)
+    * [Transmutes](transmutes.md)
 * [Uninitialized Memory](uninitialized.md)
-	* [Checked](checked-uninit.md)
-	* [Drop Flags](drop-flags.md)
-	* [Unchecked](unchecked-uninit.md)
+    * [Checked](checked-uninit.md)
+    * [Drop Flags](drop-flags.md)
+    * [Unchecked](unchecked-uninit.md)
 * [Ownership Based Resource Management](obrm.md)
-	* [Constructors](constructors.md)
-	* [Destructors](destructors.md)
-	* [Leaking](leaking.md)
+    * [Constructors](constructors.md)
+    * [Destructors](destructors.md)
+    * [Leaking](leaking.md)
 * [Unwinding](unwinding.md)
-	* [Exception Safety](exception-safety.md)
-	* [Poisoning](poisoning.md)
+    * [Exception Safety](exception-safety.md)
+    * [Poisoning](poisoning.md)
 * [Concurrency](concurrency.md)
-	* [Races](races.md)
-	* [Send and Sync](send-and-sync.md)
-	* [Atomics](atomics.md)
+    * [Races](races.md)
+    * [Send and Sync](send-and-sync.md)
+    * [Atomics](atomics.md)
 * [Implementing Vec](vec.md)
-	* [Layout](vec-layout.md)
-	* [Allocating](vec-alloc.md)
-	* [Push and Pop](vec-push-pop.md)
-	* [Deallocating](vec-dealloc.md)
-	* [Deref](vec-deref.md)
-	* [Insert and Remove](vec-insert-remove.md)
-	* [IntoIter](vec-into-iter.md)
-	* [RawVec](vec-raw.md)
-	* [Drain](vec-drain.md)
-	* [Handling Zero-Sized Types](vec-zsts.md)
-	* [Final Code](vec-final.md)
+    * [Layout](vec-layout.md)
+    * [Allocating](vec-alloc.md)
+    * [Push and Pop](vec-push-pop.md)
+    * [Deallocating](vec-dealloc.md)
+    * [Deref](vec-deref.md)
+    * [Insert and Remove](vec-insert-remove.md)
+    * [IntoIter](vec-into-iter.md)
+    * [RawVec](vec-raw.md)
+    * [Drain](vec-drain.md)
+    * [Handling Zero-Sized Types](vec-zsts.md)
+    * [Final Code](vec-final.md)
 * [Implementing Arc and Mutex](arc-and-mutex.md)
 * [FFI](ffi.md)
 * [Beneath `std`](beneath-std.md)
-	* [#[panic_handler]](panic-handler.md)
+    * [#[panic_handler]](panic-handler.md)