Improve primitive/std docs separation and headers

Author: camsteffen

library/alloc/src/boxed.rs

@@ -1,4 +1,4 @@
-//! A pointer type for heap allocation.
+//! The `Box<T>` type for heap allocation.
 //!
 //! [`Box<T>`], casually referred to as a 'box', provides the simplest form of
 //! heap allocation in Rust. Boxes provide ownership for this allocation, and

library/alloc/src/slice.rs

@@ -1,82 +1,12 @@
-//! A dynamically-sized view into a contiguous sequence, `[T]`.
+//! Utilities for the slice primitive type.
 //!
 //! *[See also the slice primitive type](slice).*
 //!
-//! Slices are a view into a block of memory represented as a pointer and a
-//! length.
+//! Most of the structs in this module are iterator types which can only be created
+//! using a certain function. For example, `slice.iter()` yields an [`Iter`].
 //!
-//! ```
-//! // slicing a Vec
-//! let vec = vec![1, 2, 3];
-//! let int_slice = &vec[..];
-//! // coercing an array to a slice
-//! let str_slice: &[&str] = &["one", "two", "three"];
-//! ```
-//!
-//! Slices are either mutable or shared. The shared slice type is `&[T]`,
-//! while the mutable slice type is `&mut [T]`, where `T` represents the element
-//! type. For example, you can mutate the block of memory that a mutable slice
-//! points to:
-//!
-//! ```
-//! let x = &mut [1, 2, 3];
-//! x[1] = 7;
-//! assert_eq!(x, &[1, 7, 3]);
-//! ```
-//!
-//! Here are some of the things this module contains:
-//!
-//! ## Structs
-//!
-//! There are several structs that are useful for slices, such as [`Iter`], which
-//! represents iteration over a slice.
-//!
-//! ## Trait Implementations
-//!
-//! There are several implementations of common traits for slices. Some examples
-//! include:
-//!
-//! * [`Clone`]
-//! * [`Eq`], [`Ord`] - for slices whose element type are [`Eq`] or [`Ord`].
-//! * [`Hash`] - for slices whose element type is [`Hash`].
-//!
-//! ## Iteration
-//!
-//! The slices implement `IntoIterator`. The iterator yields references to the
-//! slice elements.
-//!
-//! ```
-//! let numbers = &[0, 1, 2];
-//! for n in numbers {
-//!     println!("{n} is a number!");
-//! }
-//! ```
-//!
-//! The mutable slice yields mutable references to the elements:
-//!
-//! ```
-//! let mut scores = [7, 8, 9];
-//! for score in &mut scores[..] {
-//!     *score += 1;
-//! }
-//! ```
-//!
-//! This iterator yields mutable references to the slice's elements, so while
-//! the element type of the slice is `i32`, the element type of the iterator is
-//! `&mut i32`.
-//!
-//! * [`.iter`] and [`.iter_mut`] are the explicit methods to return the default
-//!   iterators.
-//! * Further methods that return iterators are [`.split`], [`.splitn`],
-//!   [`.chunks`], [`.windows`] and more.
-//!
-//! [`Hash`]: core::hash::Hash
-//! [`.iter`]: slice::iter
-//! [`.iter_mut`]: slice::iter_mut
-//! [`.split`]: slice::split
-//! [`.splitn`]: slice::splitn
-//! [`.chunks`]: slice::chunks
-//! [`.windows`]: slice::windows
+//! A few functions are provided to create a slice from a value reference
+//! or from a raw pointer.
 #![stable(feature = "rust1", since = "1.0.0")]
 // Many of the usings in this module are only used in the test configuration.
 // It's cleaner to just turn off the unused_imports warning than to fix them.

library/alloc/src/str.rs

@@ -1,26 +1,6 @@
-//! Unicode string slices.
+//! Utilities for the `str` primitive type.
 //!
 //! *[See also the `str` primitive type](str).*
-//!
-//! The `&str` type is one of the two main string types, the other being `String`.
-//! Unlike its `String` counterpart, its contents are borrowed.
-//!
-//! # Basic Usage
-//!
-//! A basic string declaration of `&str` type:
-//!
-//! ```
-//! let hello_world = "Hello, World!";
-//! ```
-//!
-//! Here we have declared a string literal, also known as a string slice.
-//! String literals have a static lifetime, which means the string `hello_world`
-//! is guaranteed to be valid for the duration of the entire program.
-//! We can explicitly specify `hello_world`'s lifetime as well:
-//!
-//! ```
-//! let hello_world: &'static str = "Hello, world!";
-//! ```
 
 #![stable(feature = "rust1", since = "1.0.0")]
 // Many of the usings in this module are only used in the test configuration.

library/core/src/any.rs

@@ -1,7 +1,4 @@
-//! This module contains the `Any` trait, which enables dynamic typing
-//! of any `'static` type through runtime reflection. It also contains the
-//! `Provider` trait and accompanying API, which enable trait objects to provide
-//! data based on typed requests, an alternate form of runtime reflection.
+//! Utilities for dynamic typing or type reflection.
 //!
 //! # `Any` and `TypeId`
 //!

library/core/src/array/mod.rs

@@ -1,4 +1,4 @@
-//! Helper functions and types for fixed-length arrays.
+//! Utilities for the array primitive type.
 //!
 //! *[See also the array primitive type](array).*
 

library/core/src/borrow.rs

@@ -1,4 +1,4 @@
-//! A module for working with borrowed data.
+//! Utilities for working with borrowed data.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

library/core/src/char/mod.rs

@@ -1,4 +1,6 @@
-//! A character type.
+//! Utilities for the `char` primitive type.
+//!
+//! *[See also the `char` primitive type](primitive@char).*
 //!
 //! The `char` type represents a single character. More specifically, since
 //! 'character' isn't a well-defined concept in Unicode, `char` is a '[Unicode

library/core/src/cmp.rs

@@ -1,6 +1,6 @@
-//! Functionality for ordering and comparison.
+//! Utilities for comparing and ordering values.
 //!
-//! This module contains various tools for ordering and comparing values. In
+//! This module contains various tools for comparing and ordering values. In
 //! summary:
 //!
 //! * [`Eq`] and [`PartialEq`] are traits that allow you to define total and

library/core/src/default.rs

@@ -1,4 +1,4 @@
-//! The `Default` trait for types which may have meaningful default values.
+//! The `Default` trait for types with a default value.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

library/core/src/num/f32.rs

@@ -1,4 +1,4 @@
-//! Constants specific to the `f32` single-precision floating point type.
+//! Constants for the `f32` single-precision floating point type.
 //!
 //! *[See also the `f32` primitive type][f32].*
 //!