Auto merge of #31523 - steveklabnik:rollup, r=steveklabnik

- Successful merges: #31473, #31513, #31514, #31515, #31516, #31520
- Failed merges:

Author: bors

src/doc/book/error-handling.md

@@ -265,7 +265,7 @@ fn map<F, T, A>(option: Option<T>, f: F) -> Option<A> where F: FnOnce(T) -> A {
 ```
 
 Indeed, `map` is [defined as a method][2] on `Option<T>` in the standard library.
-As a method, it has a slighly different signature: methods take `self`, `&self`,
+As a method, it has a slightly different signature: methods take `self`, `&self`,
 or `&mut self` as their first argument.
 
 Armed with our new combinator, we can rewrite our `extension_explicit` method
@@ -1592,7 +1592,7 @@ fn print_usage(program: &str, opts: Options) {
 
 fn main() {
     let args: Vec<String> = env::args().collect();
-    let program = args[0].clone();
+    let program = &args[0];
 
     let mut opts = Options::new();
     opts.optflag("h", "help", "Show this usage message.");
@@ -1605,10 +1605,10 @@ fn main() {
         print_usage(&program, opts);
         return;
     }
-    let data_path = args[1].clone();
-    let city = args[2].clone();
+    let data_path = &args[1];
+    let city = &args[2];
 
-	// Do stuff with information
+    // Do stuff with information
 }
 ```
 
@@ -1640,7 +1640,6 @@ sure to add `extern crate csv;` to the top of your file.)
 
 ```rust,ignore
 use std::fs::File;
-use std::path::Path;
 
 // This struct represents the data in each row of the CSV file.
 // Type based decoding absolves us of a lot of the nitty gritty error
@@ -1666,7 +1665,7 @@ fn print_usage(program: &str, opts: Options) {
 
 fn main() {
     let args: Vec<String> = env::args().collect();
-    let program = args[0].clone();
+    let program = &args[0];
 
     let mut opts = Options::new();
     opts.optflag("h", "help", "Show this usage message.");
@@ -1678,25 +1677,24 @@ fn main() {
 
     if matches.opt_present("h") {
         print_usage(&program, opts);
-		return;
-	}
+        return;
+    }
 
-	let data_file = args[1].clone();
-	let data_path = Path::new(&data_file);
-	let city = args[2].clone();
+    let data_path = &args[1];
+    let city: &str = &args[2];
 
-	let file = File::open(data_path).unwrap();
-	let mut rdr = csv::Reader::from_reader(file);
+    let file = File::open(data_path).unwrap();
+    let mut rdr = csv::Reader::from_reader(file);
 
-	for row in rdr.decode::<Row>() {
-		let row = row.unwrap();
+    for row in rdr.decode::<Row>() {
+        let row = row.unwrap();
 
-		if row.city == city {
-			println!("{}, {}: {:?}",
-				row.city, row.country,
-				row.population.expect("population count"));
-		}
-	}
+        if row.city == city {
+            println!("{}, {}: {:?}",
+                row.city, row.country,
+                row.population.expect("population count"));
+        }
+    }
 }
 ```
 
@@ -1745,6 +1743,8 @@ Note that we opt to handle the possibility of a missing population count by
 simply ignoring that row.
 
 ```rust,ignore
+use std::path::Path;
+
 struct Row {
     // unchanged
 }
@@ -1782,27 +1782,26 @@ fn search<P: AsRef<Path>>(file_path: P, city: &str) -> Vec<PopulationCount> {
 }
 
 fn main() {
-	let args: Vec<String> = env::args().collect();
-	let program = args[0].clone();
+    let args: Vec<String> = env::args().collect();
+    let program = &args[0];
 
-	let mut opts = Options::new();
-	opts.optflag("h", "help", "Show this usage message.");
+    let mut opts = Options::new();
+    opts.optflag("h", "help", "Show this usage message.");
 
-	let matches = match opts.parse(&args[1..]) {
-		Ok(m)  => { m }
-		Err(e) => { panic!(e.to_string()) }
-	};
-	if matches.opt_present("h") {
-		print_usage(&program, opts);
-		return;
-	}
+    let matches = match opts.parse(&args[1..]) {
+        Ok(m)  => { m }
+        Err(e) => { panic!(e.to_string()) }
+    };
+    if matches.opt_present("h") {
+        print_usage(&program, opts);
+        return;
+    }
 
-	let data_file = args[1].clone();
-	let data_path = Path::new(&data_file);
-	let city = args[2].clone();
-	for pop in search(&data_path, &city) {
-		println!("{}, {}: {:?}", pop.city, pop.country, pop.count);
-	}
+    let data_path = &args[1];
+    let city = &args[2];
+    for pop in search(data_path, city) {
+        println!("{}, {}: {:?}", pop.city, pop.country, pop.count);
+    }
 }
 
 ```
@@ -1912,7 +1911,7 @@ First, here's the new usage:
 
 ```rust,ignore
 fn print_usage(program: &str, opts: Options) {
-	println!("{}", opts.usage(&format!("Usage: {} [options] <city>", program)));
+    println!("{}", opts.usage(&format!("Usage: {} [options] <city>", program)));
 }
 ```
 The next part is going to be only a little harder:
@@ -1924,16 +1923,16 @@ opts.optopt("f", "file", "Choose an input file, instead of using STDIN.", "NAME"
 opts.optflag("h", "help", "Show this usage message.");
 ...
 let file = matches.opt_str("f");
-let data_file = file.as_ref().map(Path::new);
+let data_file = &file.as_ref().map(Path::new);
 
 let city = if !matches.free.is_empty() {
-	matches.free[0].clone()
+    &matches.free[0]
 } else {
-	print_usage(&program, opts);
-	return;
+    print_usage(&program, opts);
+    return;
 };
 
-match search(&data_file, &city) {
+match search(data_file, city) {
     Ok(pops) => {
         for pop in pops {
             println!("{}, {}: {:?}", pop.city, pop.country, pop.count);

src/libbacktrace/ansidecl.h

@@ -1,4 +1,4 @@
-/* ANSI and traditional C compatability macros
+/* ANSI and traditional C compatibility macros
    Copyright (C) 1991-2015 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 

src/libcollections/btree/node.rs

@@ -28,7 +28,7 @@
 // }
 // ```
 //
-// Since Rust doesn't acutally have dependent types and polymorphic recursion,
+// Since Rust doesn't actually have dependent types and polymorphic recursion,
 // we make do with lots of unsafety.
 
 use alloc::heap;

src/libcollections/str.rs

@@ -1808,7 +1808,7 @@ impl str {
                 // Σ maps to σ, except at the end of a word where it maps to ς.
                 // This is the only conditional (contextual) but language-independent mapping
                 // in `SpecialCasing.txt`,
-                // so hard-code it rather than have a generic "condition" mechanim.
+                // so hard-code it rather than have a generic "condition" mechanism.
                 // See https://github.com/rust-lang/rust/issues/26035
                 map_uppercase_sigma(self, i, &mut s)
             } else {

src/libcollections/string.rs

@@ -193,7 +193,7 @@ use boxed::Box;
 /// mem::forget(story);
 ///
 /// // We can re-build a String out of ptr, len, and capacity. This is all
-/// // unsafe becuase we are responsible for making sure the components are
+/// // unsafe because we are responsible for making sure the components are
 /// // valid:
 /// let s = unsafe { String::from_raw_parts(ptr as *mut _, len, capacity) } ;
 ///
@@ -1842,6 +1842,12 @@ impl fmt::Write for String {
 }
 
 /// A draining iterator for `String`.
+///
+/// This struct is created by the [`drain()`] method on [`String`]. See its
+/// documentation for more.
+///
+/// [`drain()`]: struct.String.html#method.drain
+/// [`String`]: struct.String.html
 #[stable(feature = "drain", since = "1.6.0")]
 pub struct Drain<'a> {
     /// Will be used as &'a mut String in the destructor

src/libcore/convert.rs

@@ -19,7 +19,7 @@
 //!
 //! - Impl the `As*` traits for reference-to-reference conversions
 //! - Impl the `Into` trait when you want to consume the value in the conversion
-//! - The `From` trait is the most flexible, usefull for values _and_ references conversions
+//! - The `From` trait is the most flexible, useful for values _and_ references conversions
 //!
 //! As a library writer, you should prefer implementing `From<T>` rather than
 //! `Into<U>`, as `From` provides greater flexibility and offer the equivalent `Into`

src/libcore/num/dec2flt/mod.rs

@@ -149,6 +149,13 @@ from_str_float_impl!(f32);
 from_str_float_impl!(f64);
 
 /// An error which can be returned when parsing a float.
+///
+/// This error is used as the error type for the [`FromStr`] implementation
+/// for [`f32`] and [`f64`].
+///
+/// [`FromStr`]: ../str/trait.FromStr.html
+/// [`f32`]: ../primitive.f32.html
+/// [`f64`]: ../primitive.f64.html
 #[derive(Debug, Clone, PartialEq)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct ParseFloatError {

src/libcore/num/mod.rs

@@ -2160,7 +2160,13 @@ impl usize {
         intrinsics::mul_with_overflow }
 }
 
-/// Used for representing the classification of floating point numbers
+/// A classification of floating point numbers.
+///
+/// This `enum` is used as the return type for [`f32::classify()`] and [`f64::classify()`]. See
+/// their documentation for more.
+///
+/// [`f32::classify()`]: ../primitive.f32.html#method.classify
+/// [`f64::classify()`]: ../primitive.f64.html#method.classify
 #[derive(Copy, Clone, PartialEq, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum FpCategory {
@@ -2387,6 +2393,11 @@ fn from_str_radix<T: FromStrRadixHelper>(src: &str, radix: u32)
 }
 
 /// An error which can be returned when parsing an integer.
+///
+/// This error is used as the error type for the `from_str_radix()` functions
+/// on the primitive integer types, such as [`i8::from_str_radix()`].
+///
+/// [`i8::from_str_radix()`]: ../std/primitive.i8.html#method.from_str_radix
 #[derive(Debug, Clone, PartialEq)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct ParseIntError { kind: IntErrorKind }

src/libcore/str/mod.rs

@@ -1740,7 +1740,7 @@ impl StrExt for str {
         let mut matcher = pat.into_searcher(self);
         if let Some((a, b)) = matcher.next_reject() {
             i = a;
-            j = b; // Rember earliest known match, correct it below if
+            j = b; // Remember earliest known match, correct it below if
                    // last match is different
         }
         if let Some((_, b)) = matcher.next_reject_back() {

src/libcore/tuple.rs

@@ -8,24 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! A finite heterogeneous sequence, `(T, U, ..)`
-//!
-//! To access a single element of a tuple one can use the `.0`
-//! field access syntax.
-//!
-//! Indexing starts from zero, so `.0` returns first value, `.1`
-//! returns second value, and so on. In general, a tuple with *N*
-//! elements has field accessors from 0 to *N* - 1.
-//!
-//! If every type inside a tuple implements one of the following
-//! traits, then a tuple itself also implements it.
-//!
-//! * `Clone`
-//! * `PartialEq`
-//! * `Eq`
-//! * `PartialOrd`
-//! * `Ord`
-//! * `Default`
+// See src/libstd/primitive_docs.rs for documentation.
 
 use clone::Clone;
 use cmp::*;