Add 'src/tools/clippy/' from commit 'd2708873ef711ec8ab45df1e984ecf24a96cd369'

git-subtree-dir: src/tools/clippy
git-subtree-mainline: 06c44816c1532e5ff08ad072f581fc068eb60e2e
git-subtree-split: d2708873ef711ec8ab45df1e984ecf24a96cd369

1 files changed, 395 insertions, 0 deletions

diff --git a/src/tools/clippy/tests/ui/cognitive_complexity.rs b/src/tools/clippy/tests/ui/cognitive_complexity.rs
new file mode 100644
index 00000000000..1d3fe405521
--- /dev/null
+++ b/src/tools/clippy/tests/ui/cognitive_complexity.rs
@@ -0,0 +1,395 @@
+#![allow(clippy::all)]
+#![warn(clippy::cognitive_complexity)]
+#![allow(unused)]
+
+#[rustfmt::skip]
+fn main() {
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+    if true {
+        println!("a");
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn kaboom() {
+    let n = 0;
+    'a: for i in 0..20 {
+        'b: for j in i..20 {
+            for k in j..20 {
+                if k == 5 {
+                    break 'b;
+                }
+                if j == 3 && k == 6 {
+                    continue 'a;
+                }
+                if k == j {
+                    continue;
+                }
+                println!("bake");
+            }
+        }
+        println!("cake");
+    }
+}
+
+fn bloo() {
+    match 42 {
+        0 => println!("hi"),
+        1 => println!("hai"),
+        2 => println!("hey"),
+        3 => println!("hallo"),
+        4 => println!("hello"),
+        5 => println!("salut"),
+        6 => println!("good morning"),
+        7 => println!("good evening"),
+        8 => println!("good afternoon"),
+        9 => println!("good night"),
+        10 => println!("bonjour"),
+        11 => println!("hej"),
+        12 => println!("hej hej"),
+        13 => println!("greetings earthling"),
+        14 => println!("take us to you leader"),
+        15 | 17 | 19 | 21 | 23 | 25 | 27 | 29 | 31 | 33 => println!("take us to you leader"),
+        35 | 37 | 39 | 41 | 43 | 45 | 47 | 49 | 51 | 53 => println!("there is no undefined behavior"),
+        55 | 57 | 59 | 61 | 63 | 65 | 67 | 69 | 71 | 73 => println!("I know borrow-fu"),
+        _ => println!("bye"),
+    }
+}
+
+// Short circuiting operations don't increase the complexity of a function.
+// Note that the minimum complexity of a function is 1.
+#[clippy::cognitive_complexity = "1"]
+fn lots_of_short_circuits() -> bool {
+    true && false && true && false && true && false && true
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn lots_of_short_circuits2() -> bool {
+    true || false || true || false || true || false || true
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn baa() {
+    let x = || match 99 {
+        0 => 0,
+        1 => 1,
+        2 => 2,
+        4 => 4,
+        6 => 6,
+        9 => 9,
+        _ => 42,
+    };
+    if x() == 42 {
+        println!("x");
+    } else {
+        println!("not x");
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn bar() {
+    match 99 {
+        0 => println!("hi"),
+        _ => println!("bye"),
+    }
+}
+
+#[test]
+#[clippy::cognitive_complexity = "1"]
+/// Tests are usually complex but simple at the same time. `clippy::cognitive_complexity` used to
+/// give lots of false-positives in tests.
+fn dont_warn_on_tests() {
+    match 99 {
+        0 => println!("hi"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barr() {
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barr2() {
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barrr() {
+    match 99 {
+        0 => println!("hi"),
+        1 => panic!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barrr2() {
+    match 99 {
+        0 => println!("hi"),
+        1 => panic!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+    match 99 {
+        0 => println!("hi"),
+        1 => panic!("bla"),
+        2 | 3 => println!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barrrr() {
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => panic!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn barrrr2() {
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => panic!("blub"),
+        _ => println!("bye"),
+    }
+    match 99 {
+        0 => println!("hi"),
+        1 => println!("bla"),
+        2 | 3 => panic!("blub"),
+        _ => println!("bye"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn cake() {
+    if 4 == 5 {
+        println!("yea");
+    } else {
+        panic!("meh");
+    }
+    println!("whee");
+}
+
+#[clippy::cognitive_complexity = "1"]
+pub fn read_file(input_path: &str) -> String {
+    use std::fs::File;
+    use std::io::{Read, Write};
+    use std::path::Path;
+    let mut file = match File::open(&Path::new(input_path)) {
+        Ok(f) => f,
+        Err(err) => {
+            panic!("Can't open {}: {}", input_path, err);
+        },
+    };
+
+    let mut bytes = Vec::new();
+
+    match file.read_to_end(&mut bytes) {
+        Ok(..) => {},
+        Err(_) => {
+            panic!("Can't read {}", input_path);
+        },
+    };
+
+    match String::from_utf8(bytes) {
+        Ok(contents) => contents,
+        Err(_) => {
+            panic!("{} is not UTF-8 encoded", input_path);
+        },
+    }
+}
+
+enum Void {}
+
+#[clippy::cognitive_complexity = "1"]
+fn void(void: Void) {
+    if true {
+        match void {}
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn mcarton_sees_all() {
+    panic!("meh");
+    panic!("möh");
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn try_() -> Result<i32, &'static str> {
+    match 5 {
+        5 => Ok(5),
+        _ => return Err("bla"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn try_again() -> Result<i32, &'static str> {
+    let _ = Ok(42)?;
+    let _ = Ok(43)?;
+    let _ = Ok(44)?;
+    let _ = Ok(45)?;
+    let _ = Ok(46)?;
+    let _ = Ok(47)?;
+    let _ = Ok(48)?;
+    let _ = Ok(49)?;
+    match 5 {
+        5 => Ok(5),
+        _ => return Err("bla"),
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn early() -> Result<i32, &'static str> {
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+    return Ok(5);
+}
+
+#[rustfmt::skip]
+#[clippy::cognitive_complexity = "1"]
+fn early_ret() -> i32 {
+    let a = if true { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    let a = if a < 99 { 42 } else { return 0; };
+    match 5 {
+        5 => 5,
+        _ => return 6,
+    }
+}
+
+#[clippy::cognitive_complexity = "1"]
+fn closures() {
+    let x = |a: i32, b: i32| -> i32 {
+        if true {
+            println!("moo");
+        }
+
+        a + b
+    };
+}
+
+struct Moo;
+
+#[clippy::cognitive_complexity = "1"]
+impl Moo {
+    fn moo(&self) {
+        if true {
+            println!("moo");
+        }
+    }
+}