Doctests: Enable running doc tests for complexity lints

clippy_lints/src/assign_ops.rs

@@ -45,7 +45,8 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// let mut a = 5;
-    /// ...
+    /// let b = 2;
+    /// // ...
     /// a += a + b;
     /// ```
     pub MISREFACTORED_ASSIGN_OP,

clippy_lints/src/double_comparison.rs

@@ -18,13 +18,17 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// x == y || x < y
+    /// # let x = 1;
+    /// # let y = 2;
+    /// if x == y || x < y {}
     /// ```
     ///
     /// Could be written as:
     ///
     /// ```rust
-    /// x <= y
+    /// # let x = 1;
+    /// # let y = 2;
+    /// if x <= y {}
     /// ```
     pub DOUBLE_COMPARISONS,
     complexity,

clippy_lints/src/double_parens.rs

@@ -13,9 +13,10 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// ((0))
-    /// foo((0))
-    /// ((1, 2))
+    /// # fn foo(bar: usize) {}
+    /// ((0));
+    /// foo((0));
+    /// ((1, 2));
     /// ```
     pub DOUBLE_PARENS,
     complexity,

clippy_lints/src/duration_subsec.rs

@@ -20,6 +20,7 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// # use std::time::Duration;
     /// let dur = Duration::new(5, 0);
     /// let _micros = dur.subsec_nanos() / 1_000;
     /// let _millis = dur.subsec_nanos() / 1_000_000;

clippy_lints/src/eval_order_dependence.rs

@@ -42,7 +42,9 @@ declare_clippy_lint! {
     /// shorthand.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,no_run
+    /// # fn b() -> bool { true }
+    /// # fn c() -> bool { true }
     /// let a = b() || panic!() || c();
     /// // `c()` is dead, `panic!()` is only called if `b()` returns `false`
     /// let x = (a, b, c, panic!());

clippy_lints/src/explicit_write.rs

@@ -16,8 +16,10 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// # use std::io::Write;
+    /// # let bar = "furchtbar";
     /// // this would be clearer as `eprintln!("foo: {:?}", bar);`
-    /// writeln!(&mut io::stderr(), "foo: {:?}", bar).unwrap();
+    /// writeln!(&mut std::io::stderr(), "foo: {:?}", bar).unwrap();
     /// ```
     pub EXPLICIT_WRITE,
     complexity,

clippy_lints/src/format.rs

@@ -26,8 +26,9 @@ declare_clippy_lint! {
     ///
     /// **Examples:**
     /// ```rust
-    /// format!("foo")
-    /// format!("{}", foo)
+    /// # let foo = "foo";
+    /// format!("foo");
+    /// format!("{}", foo);
     /// ```
     pub USELESS_FORMAT,
     complexity,

clippy_lints/src/functions.rs

@@ -23,8 +23,9 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// # struct Color;
     /// fn foo(x: u32, y: u32, name: &str, c: Color, w: f32, h: f32, a: f32, b: f32) {
-    ///     ..
+    ///     // ..
     /// }
     /// ```
     pub TOO_MANY_ARGUMENTS,

clippy_lints/src/identity_op.rs

@@ -17,7 +17,8 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// x / 1 + 0 * 1 - 0 | 0
+    /// # let x = 1;
+    /// x / 1 + 0 * 1 - 0 | 0;
     /// ```
     pub IDENTITY_OP,
     complexity,

clippy_lints/src/int_plus_one.rs

@@ -17,13 +17,17 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// x >= y + 1
+    /// # let x = 1;
+    /// # let y = 1;
+    /// if x >= y + 1 {}
     /// ```
     ///
-    /// Could be written:
+    /// Could be written as:
     ///
     /// ```rust
-    /// x > y
+    /// # let x = 1;
+    /// # let y = 1;
+    /// if x > y {}
     /// ```
     pub INT_PLUS_ONE,
     complexity,

clippy_lints/src/lib.rs

@@ -100,7 +100,7 @@ macro_rules! declare_clippy_lint {
     };
     { $(#[$attr:meta])* pub $name:tt, complexity, $description:tt } => {
         declare_tool_lint! {
-            pub clippy::$name, Warn, $description, report_in_external_macro: true
+            $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
         }
     };
     { $(#[$attr:meta])* pub $name:tt, perf, $description:tt } => {
@@ -130,12 +130,12 @@ macro_rules! declare_clippy_lint {
     };
     { $(#[$attr:meta])* pub $name:tt, internal, $description:tt } => {
         declare_tool_lint! {
-            pub clippy::$name, Allow, $description, report_in_external_macro: true
+            $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
         }
     };
     { $(#[$attr:meta])* pub $name:tt, internal_warn, $description:tt } => {
         declare_tool_lint! {
-            pub clippy::$name, Warn, $description, report_in_external_macro: true
+            $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
         }
     };
 }

clippy_lints/src/lifetimes.rs

@@ -47,7 +47,7 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// fn unused_lifetime<'a>(x: u8) {
-    ///     ..
+    ///     // ..
     /// }
     /// ```
     pub EXTRA_UNUSED_LIFETIMES,

clippy_lints/src/loops.rs

@@ -217,18 +217,19 @@ declare_clippy_lint! {
     /// **Known problems:** Sometimes the wrong binding is displayed (#383).
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,no_run
+    /// # let y = Some(1);
     /// loop {
     ///     let x = match y {
     ///         Some(x) => x,
     ///         None => break,
-    ///     }
+    ///     };
     ///     // .. do something with x
     /// }
     /// // is easier written as
     /// while let Some(x) = y {
     ///     // .. do something with x
-    /// }
+    /// };
     /// ```
     pub WHILE_LET_LOOP,
     complexity,
@@ -309,8 +310,11 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```ignore
-    /// for i in 0..v.len() { foo(v[i]);
+    /// ```rust
+    /// # let v = vec![1];
+    /// # fn foo(bar: usize) {}
+    /// # fn bar(bar: usize, baz: usize) {}
+    /// for i in 0..v.len() { foo(v[i]); }
     /// for i in 0..v.len() { bar(i, v[i]); }
     /// ```
     pub EXPLICIT_COUNTER_LOOP,

clippy_lints/src/map_unit_fn.rs

@@ -20,20 +20,29 @@ declare_clippy_lint! {
     /// **Example:**
     ///
     /// ```rust
-    /// let x: Option<&str> = do_stuff();
+    /// # fn do_stuff() -> Option<String> { Some(String::new()) }
+    /// # fn log_err_msg(foo: String) -> Option<String> { Some(foo) }
+    /// # fn format_msg(foo: String) -> String { String::new() }
+    /// let x: Option<String> = do_stuff();
     /// x.map(log_err_msg);
-    /// x.map(|msg| log_err_msg(format_msg(msg)))
+    /// # let x: Option<String> = do_stuff();
+    /// x.map(|msg| log_err_msg(format_msg(msg)));
     /// ```
     ///
     /// The correct use would be:
     ///
     /// ```rust
-    /// let x: Option<&str> = do_stuff();
+    /// # fn do_stuff() -> Option<String> { Some(String::new()) }
+    /// # fn log_err_msg(foo: String) -> Option<String> { Some(foo) }
+    /// # fn format_msg(foo: String) -> String { String::new() }
+    /// let x: Option<String> = do_stuff();
     /// if let Some(msg) = x {
-    ///     log_err_msg(msg)
+    ///     log_err_msg(msg);
     /// }
+    ///
+    /// # let x: Option<String> = do_stuff();
     /// if let Some(msg) = x {
-    ///     log_err_msg(format_msg(msg))
+    ///     log_err_msg(format_msg(msg));
     /// }
     /// ```
     pub OPTION_MAP_UNIT_FN,
@@ -53,21 +62,29 @@ declare_clippy_lint! {
     /// **Example:**
     ///
     /// ```rust
-    /// let x: Result<&str, &str> = do_stuff();
+    /// # fn do_stuff() -> Result<String, String> { Ok(String::new()) }
+    /// # fn log_err_msg(foo: String) -> Result<String, String> { Ok(foo) }
+    /// # fn format_msg(foo: String) -> String { String::new() }
+    /// let x: Result<String, String> = do_stuff();
     /// x.map(log_err_msg);
-    /// x.map(|msg| log_err_msg(format_msg(msg)))
+    /// # let x: Result<String, String> = do_stuff();
+    /// x.map(|msg| log_err_msg(format_msg(msg)));
     /// ```
     ///
     /// The correct use would be:
     ///
     /// ```rust
-    /// let x: Result<&str, &str> = do_stuff();
+    /// # fn do_stuff() -> Result<String, String> { Ok(String::new()) }
+    /// # fn log_err_msg(foo: String) -> Result<String, String> { Ok(foo) }
+    /// # fn format_msg(foo: String) -> String { String::new() }
+    /// let x: Result<String, String> = do_stuff();
     /// if let Ok(msg) = x {
-    ///     log_err_msg(msg)
-    /// }
+    ///     log_err_msg(msg);
+    /// };
+    /// # let x: Result<String, String> = do_stuff();
     /// if let Ok(msg) = x {
-    ///     log_err_msg(format_msg(msg))
-    /// }
+    ///     log_err_msg(format_msg(msg));
+    /// };
     /// ```
     pub RESULT_MAP_UNIT_FN,
     complexity,

clippy_lints/src/methods/mod.rs

@@ -247,7 +247,8 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// iter.filter(|x| x == 0).next()
+    /// # let vec = vec![1];
+    /// vec.iter().filter(|x| **x == 0).next();
     /// ```
     pub FILTER_NEXT,
     complexity,
@@ -345,7 +346,8 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// iter.find(|x| x == 0).is_some()
+    /// # let vec = vec![1];
+    /// vec.iter().find(|x| **x == 0).is_some();
     /// ```
     pub SEARCH_IS_SOME,
     complexity,
@@ -363,7 +365,8 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// name.chars().next() == Some('_')
+    /// let name = "foo";
+    /// name.chars().next() == Some('_');
     /// ```
     pub CHARS_NEXT_CMP,
     complexity,
@@ -434,7 +437,7 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// 42u64.clone()
+    /// 42u64.clone();
     /// ```
     pub CLONE_ON_COPY,
     complexity,
@@ -708,11 +711,13 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// # fn do_stuff(x: &[i32]) {}
     /// let x: &[i32] = &[1, 2, 3, 4, 5];
     /// do_stuff(x.as_ref());
     /// ```
     /// The correct use would be:
     /// ```rust
+    /// # fn do_stuff(x: &[i32]) {}
     /// let x: &[i32] = &[1, 2, 3, 4, 5];
     /// do_stuff(x);
     /// ```

clippy_lints/src/misc.rs

@@ -184,7 +184,7 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// f() && g(); // We should write `if f() { g(); }`.
     /// ```
     pub SHORT_CIRCUIT_STATEMENT,

clippy_lints/src/misc_early.rs

@@ -53,7 +53,7 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// (|| 42)()
     /// ```
     pub REDUNDANT_CLOSURE_CALL,

clippy_lints/src/needless_bool.rs

@@ -24,7 +24,7 @@ declare_clippy_lint! {
     /// shorter code.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// if x {
     ///     false
     /// } else {
@@ -46,7 +46,7 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// if x == true {} // could be `if x { }`
     /// ```
     pub BOOL_COMPARISON,

clippy_lints/src/needless_borrowed_ref.rs

@@ -18,16 +18,15 @@ declare_clippy_lint! {
     ///
     /// **Known problems:** It seems that the `&ref` pattern is sometimes useful.
     /// For instance in the following snippet:
-    /// ```rust
+    /// ```rust,ignore
     /// enum Animal {
     ///     Cat(u64),
     ///     Dog(u64),
     /// }
     ///
     /// fn foo(a: &Animal, b: &Animal) {
     ///     match (a, b) {
-    /// (&Animal::Cat(v), k) | (k, &Animal::Cat(v)) => (), // lifetime
-    /// mismatch error
+    ///         (&Animal::Cat(v), k) | (k, &Animal::Cat(v)) => (), // lifetime mismatch error
     ///         (&Animal::Dog(ref c), &Animal::Dog(_)) => ()
     ///     }
     /// }

clippy_lints/src/needless_update.rs

@@ -15,11 +15,17 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
+    /// # struct Point {
+    /// #     x: i32,
+    /// #     y: i32,
+    /// #     z: i32,
+    /// # }
+    /// # let zero_point = Point { x: 0, y: 0, z: 0 };
     /// Point {
     ///     x: 1,
-    ///     y: 0,
+    ///     y: 1,
     ///     ..zero_point
-    /// }
+    /// };
     /// ```
     pub NEEDLESS_UPDATE,
     complexity,