Add more corrected code for doc

Author: ThibsG

clippy_lints/src/methods/mod.rs

@@ -218,7 +218,12 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// # let x = Ok::<_, ()>(());
-    /// x.ok().expect("why did I do this again?")
+    ///
+    /// // Bad
+    /// x.ok().expect("why did I do this again?");
+    ///
+    /// // Good
+    /// x.expect("why did I do this again?");
     /// ```
     pub OK_EXPECT,
     style,
@@ -273,8 +278,12 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// # let opt = Some(1);
-    /// opt.map_or(None, |a| Some(a + 1))
-    /// # ;
+    ///
+    /// // Bad
+    /// opt.map_or(None, |a| Some(a + 1));
+    ///
+    /// // Good
+    /// opt.and_then(|a| Some(a + 1));
     /// ```
     pub OPTION_MAP_OR_NONE,
     style,
@@ -390,14 +399,19 @@ declare_clippy_lint! {
     /// **What it does:** Checks for usage of `_.map(_).flatten(_)`,
     ///
     /// **Why is this bad?** Readability, this can be written more concisely as a
-    /// single method call.
+    /// single method call using `_.flat_map(_)`
     ///
     /// **Known problems:**
     ///
     /// **Example:**
     /// ```rust
     /// let vec = vec![vec![1]];
+    ///
+    /// // Bad
     /// vec.iter().map(|x| x.iter()).flatten();
+    ///
+    /// // Good
+    /// vec.iter().flat_map(|x| x.iter());
     /// ```
     pub MAP_FLATTEN,
     pedantic,
@@ -417,7 +431,12 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// let vec = vec![1];
+    ///
+    /// // Bad
     /// vec.iter().filter(|x| **x == 0).map(|x| *x * 2);
+    ///
+    /// // Good
+    /// vec.iter().filter_map(|x| Some(*x * 2));
     /// ```
     pub FILTER_MAP,
     pedantic,
@@ -634,7 +653,12 @@ declare_clippy_lint! {
     /// ```rust
     /// # use std::rc::Rc;
     /// let x = Rc::new(1);
+    ///
+    /// // Bad
     /// x.clone();
+    ///
+    /// // Good
+    /// Rc::clone(&x);
     /// ```
     pub CLONE_ON_REF_PTR,
     restriction,
@@ -741,7 +765,12 @@ declare_clippy_lint! {
     /// **Known problems:** Does not catch multi-byte unicode characters.
     ///
     /// **Example:**
-    /// `_.split("x")` could be `_.split('x')`
+    /// ```rust,ignore
+    /// // Bad
+    /// _.split("x");
+    ///
+    /// // Good
+    /// _.split('x');
     pub SINGLE_CHAR_PATTERN,
     perf,
     "using a single-character str where a char could be used, e.g., `_.split(\"x\")`"
@@ -964,8 +993,8 @@ declare_clippy_lint! {
 }
 
 declare_clippy_lint! {
-    /// **What it does:** Checks for usage of `.chars().last()` or
-    /// `.chars().next_back()` on a `str` to check if it ends with a given char.
+    /// **What it does:** Checks for usage of `_.chars().last()` or
+    /// `_.chars().next_back()` on a `str` to check if it ends with a given char.
     ///
     /// **Why is this bad?** Readability, this can be written more concisely as
     /// `_.ends_with(_)`.
@@ -975,8 +1004,12 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// # let name = "_";
-    /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-')
-    /// # ;
+    ///
+    /// // Bad
+    /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-');
+    ///
+    /// // Good
+    /// name.ends_with('_') || name.ends_with('-');
     /// ```
     pub CHARS_LAST_CMP,
     style,
@@ -1044,17 +1077,15 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// let _ = (0..3).filter_map(|x| if x > 2 { Some(x) } else { None });
-    /// ```
-    /// As there is no transformation of the argument this could be written as:
-    /// ```rust
+    ///
+    /// // As there is no transformation of the argument this could be written as:
     /// let _ = (0..3).filter(|&x| x > 2);
     /// ```
     ///
     /// ```rust
     /// let _ = (0..4).filter_map(|x| Some(x + 1));
-    /// ```
-    /// As there is no conditional check on the argument this could be written as:
-    /// ```rust
+    ///
+    /// // As there is no conditional check on the argument this could be written as:
     /// let _ = (0..4).map(|x| x + 1);
     /// ```
     pub UNNECESSARY_FILTER_MAP,
@@ -1075,7 +1106,11 @@ declare_clippy_lint! {
     /// **Example:**
     ///
     /// ```rust
+    /// // Bad
     /// let _ = (&vec![3, 4, 5]).into_iter();
+    ///
+    /// // Good
+    /// let _ = (&vec![3, 4, 5]).iter();
     /// ```
     pub INTO_ITER_ON_REF,
     style,

clippy_lints/src/misc.rs

@@ -93,7 +93,7 @@ declare_clippy_lint! {
     /// ```rust
     /// let x = 1.2331f64;
     /// let y = 1.2332f64;
-    /// 
+    ///
     /// // Bad
     /// if y == 1.23f64 { }
     /// if y != x {} // where both are floats

clippy_lints/src/vec.rs

@@ -17,8 +17,14 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust,ignore
-    /// foo(&vec![1, 2])
+    /// ```rust
+    /// # fn foo(my_vec: &[u8]) {}
+    ///
+    /// // Bad
+    /// foo(&vec![1, 2]);
+    ///
+    /// // Good
+    /// foo(&[1, 2]);
     /// ```
     pub USELESS_VEC,
     perf,

clippy_lints/src/verbose_file_reads.rs

@@ -9,6 +9,7 @@ declare_clippy_lint! {
     ///
     /// **Why is this bad?** `fs::{read, read_to_string}` provide the same functionality when `buf` is empty with fewer imports and no intermediate values.
     /// See also: [fs::read docs](https://doc.rust-lang.org/std/fs/fn.read.html), [fs::read_to_string docs](https://doc.rust-lang.org/std/fs/fn.read_to_string.html)
+    ///
     /// **Known problems:** None.
     ///
     /// **Example:**

clippy_lints/src/wildcard_imports.rs

@@ -19,8 +19,14 @@ declare_clippy_lint! {
     /// still around.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
+    /// // Bad
     /// use std::cmp::Ordering::*;
+    /// foo(Less);
+    ///
+    /// // Good
+    /// use std::cmp::Ordering;
+    /// foo(Ordering::Less)
     /// ```
     pub ENUM_GLOB_USE,
     pedantic,
@@ -60,15 +66,15 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     ///
-    /// Bad:
     /// ```rust,ignore
+    /// // Bad
     /// use crate1::*;
     ///
     /// foo();
     /// ```
     ///
-    /// Good:
     /// ```rust,ignore
+    /// // Good
     /// use crate1::foo;
     ///
     /// foo();

clippy_lints/src/write.rs

@@ -23,7 +23,11 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// // Bad
     /// println!("");
+    ///
+    /// // Good
+    /// println!();
     /// ```
     pub PRINTLN_EMPTY_STRING,
     style,
@@ -32,8 +36,7 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// **What it does:** This lint warns when you use `print!()` with a format
-    /// string that
-    /// ends in a newline.
+    /// string that ends in a newline.
     ///
     /// **Why is this bad?** You should use `println!()` instead, which appends the
     /// newline.
@@ -125,7 +128,12 @@ declare_clippy_lint! {
     /// ```rust
     /// # use std::fmt::Write;
     /// # let mut buf = String::new();
+    ///
+    /// // Bad
     /// writeln!(buf, "");
+    ///
+    /// // Good
+    /// writeln!(buf);
     /// ```
     pub WRITELN_EMPTY_STRING,
     style,
@@ -147,7 +155,12 @@ declare_clippy_lint! {
     /// # use std::fmt::Write;
     /// # let mut buf = String::new();
     /// # let name = "World";
+    ///
+    /// // Bad
     /// write!(buf, "Hello {}!\n", name);
+    ///
+    /// // Good
+    /// writeln!(buf, "Hello {}!", name);
     /// ```
     pub WRITE_WITH_NEWLINE,
     style,
@@ -168,7 +181,12 @@ declare_clippy_lint! {
     /// ```rust
     /// # use std::fmt::Write;
     /// # let mut buf = String::new();
+    ///
+    /// // Bad
     /// writeln!(buf, "{}", "foo");
+    ///
+    /// // Good
+    /// writeln!(buf, "foo");
     /// ```
     pub WRITE_LITERAL,
     style,

clippy_lints/src/zero_div_zero.rs

@@ -14,7 +14,11 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// 0.0f32 / 0.0;
+    /// // Bad
+    /// let nan = 0.0f32 / 0.0;
+    ///
+    /// // Good
+    /// let nan = f32::NAN;
     /// ```
     pub ZERO_DIVIDED_BY_ZERO,
     complexity,