auto merge of #14019 : brson/rust/docs, r=alexcrichton

Just small bits of polish.

Author: bors

src/libcore/cast.rs

@@ -14,32 +14,6 @@ use mem;
 use intrinsics;
 use ptr::copy_nonoverlapping_memory;
 
-/// Casts the value at `src` to U. The two types must have the same length.
-#[inline]
-pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
-    let mut dest: U = mem::uninit();
-    let dest_ptr: *mut u8 = transmute(&mut dest);
-    let src_ptr: *u8 = transmute(src);
-    copy_nonoverlapping_memory(dest_ptr, src_ptr, mem::size_of::<U>());
-    dest
-}
-
-/**
- * Move a thing into the void
- *
- * The forget function will take ownership of the provided value but neglect
- * to run any required cleanup or memory-management operations on it.
- */
-#[inline]
-pub unsafe fn forget<T>(thing: T) { intrinsics::forget(thing); }
-
-/**
- * Force-increment the reference count on a shared box. If used
- * carelessly, this can leak the box.
- */
-#[inline]
-pub unsafe fn bump_box_refcount<T>(t: @T) { forget(t); }
-
 /**
  * Transform a value of one type into a value of another type.
  * Both types must have the same size and alignment.
@@ -54,10 +28,29 @@ pub unsafe fn bump_box_refcount<T>(t: @T) { forget(t); }
  * ```
  */
 #[inline]
-pub unsafe fn transmute<L, G>(thing: L) -> G {
+pub unsafe fn transmute<T, U>(thing: T) -> U {
     intrinsics::transmute(thing)
 }
 
+/**
+ * Move a thing into the void
+ *
+ * The forget function will take ownership of the provided value but neglect
+ * to run any required cleanup or memory-management operations on it.
+ */
+#[inline]
+pub unsafe fn forget<T>(thing: T) { intrinsics::forget(thing); }
+
+/// Casts the value at `src` to U. The two types must have the same length.
+#[inline]
+pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
+    let mut dest: U = mem::uninit();
+    let dest_ptr: *mut u8 = transmute(&mut dest);
+    let src_ptr: *u8 = transmute(src);
+    copy_nonoverlapping_memory(dest_ptr, src_ptr, mem::size_of::<U>());
+    dest
+}
+
 /// Coerce an immutable reference to be mutable.
 #[inline]
 #[deprecated="casting &T to &mut T is undefined behaviour: use Cell<T>, RefCell<T> or Unsafe<T>"]
@@ -106,7 +99,7 @@ pub unsafe fn copy_lifetime_vec<'a,S,T>(_ptr: &'a [S], ptr: &T) -> &'a T {
 
 #[cfg(test)]
 mod tests {
-    use cast::{bump_box_refcount, transmute};
+    use cast::transmute;
     use raw;
     use realstd::str::StrAllocating;
 
@@ -115,21 +108,6 @@ mod tests {
         assert_eq!(1u, unsafe { ::cast::transmute_copy(&1) });
     }
 
-    #[test]
-    fn test_bump_managed_refcount() {
-        unsafe {
-            let managed = @"box box box".to_owned();      // refcount 1
-            bump_box_refcount(managed);     // refcount 2
-            let ptr: *int = transmute(managed); // refcount 2
-            let _box1: @~str = ::cast::transmute_copy(&ptr);
-            let _box2: @~str = ::cast::transmute_copy(&ptr);
-            assert!(*_box1 == "box box box".to_owned());
-            assert!(*_box2 == "box box box".to_owned());
-            // Will destroy _box1 and _box2. Without the bump, this would
-            // use-after-free. With too many bumps, it would leak.
-        }
-    }
-
     #[test]
     fn test_transmute() {
         unsafe {

src/libcore/cell.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Types dealing with dynamic mutability
+//! Types that provide interior mutability.
 
 use clone::Clone;
 use cmp::Eq;

src/libcore/ptr.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// FIXME: talk about offset, copy_memory, copy_nonoverlapping_memory
+
 //! Conveniences for working with unsafe pointers, the `*T`, and `*mut T` types.
 //!
 //! Working with unsafe pointers in Rust is fairly uncommon,

src/libstd/lib.rs

@@ -81,7 +81,7 @@
 //! memory types, including [`atomics`](sync/atomics/index.html).
 //!
 //! Common types of I/O, including files, TCP, UPD, pipes, Unix domain sockets,
-//! timers, and process spawning, are defined in the [`io`](io/index.html).
+//! timers, and process spawning, are defined in the [`io`](io/index.html) module.
 //!
 //! Rust's I/O and concurrency depends on a small runtime interface
 //! that lives, along with its support code, in mod [`rt`](rt/index.html).
@@ -90,10 +90,11 @@
 //!
 //! ## The Rust prelude and macros
 //!
-//! Finally, the [`prelude`](prelude/index.html) defines a set of
+//! Finally, the [`prelude`](prelude/index.html) defines a
 //! common set of traits, types, and functions that are made available
 //! to all code by default. [`macros`](macros/index.html) contains
-//! all the standard macros, such as `assert!`, `fail!`, `println!`.
+//! all the standard macros, such as `assert!`, `fail!`, `println!`,
+//! and `format!`, also available to all Rust code.
 
 #![crate_id = "std#0.11-pre"]
 #![comment = "The Rust standard library"]