Split some UI tests

tests/ui/cstring.rs

@@ -0,0 +1,8 @@
+fn main() {}
+
+#[allow(result_unwrap_used)]
+fn temporary_cstring() {
+    use std::ffi::CString;
+
+    CString::new("foo").unwrap().as_ptr();
+}

tests/ui/cstring.stderr

@@ -0,0 +1,22 @@
+error: function is never used: `temporary_cstring`
+ --> $DIR/cstring.rs:4:1
+  |
+4 | fn temporary_cstring() {
+  | ^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `-D dead-code` implied by `-D warnings`
+
+error: you are getting the inner pointer of a temporary `CString`
+ --> $DIR/cstring.rs:7:5
+  |
+7 |     CString::new("foo").unwrap().as_ptr();
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `-D temporary-cstring-as-ptr` implied by `-D warnings`
+  = note: that pointer will be invalid outside this expression
+help: assign the `CString` to a variable to extend its lifetime
+ --> $DIR/cstring.rs:7:5
+  |
+7 |     CString::new("foo").unwrap().as_ptr();
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+

tests/ui/get_unwrap.rs

@@ -0,0 +1,46 @@
+#![allow(unused_mut)]
+
+use std::collections::BTreeMap;
+use std::collections::HashMap;
+use std::collections::VecDeque;
+use std::iter::FromIterator;
+
+struct GetFalsePositive {
+    arr: [u32; 3],
+}
+
+impl GetFalsePositive {
+    fn get(&self, pos: usize) -> Option<&u32> { self.arr.get(pos) }
+    fn get_mut(&mut self, pos: usize) -> Option<&mut u32> { self.arr.get_mut(pos) }
+}
+
+fn main() {
+    let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
+    let mut some_slice = &mut [0, 1, 2, 3];
+    let mut some_vec = vec![0, 1, 2, 3];
+    let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect();
+    let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]);
+    let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]);
+    let mut false_positive = GetFalsePositive { arr: [0, 1, 2] };
+
+    { // Test `get().unwrap()`
+        let _ = boxed_slice.get(1).unwrap();
+        let _ = some_slice.get(0).unwrap();
+        let _ = some_vec.get(0).unwrap();
+        let _ = some_vecdeque.get(0).unwrap();
+        let _ = some_hashmap.get(&1).unwrap();
+        let _ = some_btreemap.get(&1).unwrap();
+        let _ = false_positive.get(0).unwrap();
+    }
+
+    { // Test `get_mut().unwrap()`
+        *boxed_slice.get_mut(0).unwrap() = 1;
+        *some_slice.get_mut(0).unwrap() = 1;
+        *some_vec.get_mut(0).unwrap() = 1;
+        *some_vecdeque.get_mut(0).unwrap() = 1;
+        // Check false positives
+        *some_hashmap.get_mut(&1).unwrap() = 'b';
+        *some_btreemap.get_mut(&1).unwrap() = 'b';
+        *false_positive.get_mut(0).unwrap() = 1;
+    }
+}

tests/ui/get_unwrap.stderr

@@ -0,0 +1,62 @@
+error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:27:17
+   |
+27 |         let _ = boxed_slice.get(1).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&boxed_slice[1]`
+   |
+   = note: `-D get-unwrap` implied by `-D warnings`
+
+error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:28:17
+   |
+28 |         let _ = some_slice.get(0).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_slice[0]`
+
+error: called `.get().unwrap()` on a Vec. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:29:17
+   |
+29 |         let _ = some_vec.get(0).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vec[0]`
+
+error: called `.get().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:30:17
+   |
+30 |         let _ = some_vecdeque.get(0).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vecdeque[0]`
+
+error: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:31:17
+   |
+31 |         let _ = some_hashmap.get(&1).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_hashmap[&1]`
+
+error: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:32:17
+   |
+32 |         let _ = some_btreemap.get(&1).unwrap();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_btreemap[&1]`
+
+error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:37:10
+   |
+37 |         *boxed_slice.get_mut(0).unwrap() = 1;
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut boxed_slice[0]`
+
+error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:38:10
+   |
+38 |         *some_slice.get_mut(0).unwrap() = 1;
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_slice[0]`
+
+error: called `.get_mut().unwrap()` on a Vec. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:39:10
+   |
+39 |         *some_vec.get_mut(0).unwrap() = 1;
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vec[0]`
+
+error: called `.get_mut().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
+  --> $DIR/get_unwrap.rs:40:10
+   |
+40 |         *some_vecdeque.get_mut(0).unwrap() = 1;
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vecdeque[0]`
+

tests/ui/methods.rs

@@ -189,15 +189,6 @@ impl IteratorFalsePositives {
     }
 }
 
-#[derive(Copy, Clone)]
-struct HasChars;
-
-impl HasChars {
-    fn chars(self) -> std::str::Chars<'static> {
-        "HasChars".chars()
-    }
-}
-
 /// Checks implementation of `FILTER_NEXT` lint
 fn filter_next() {
     let v = vec![3, 2, 1, 0, -1, -2, -3];
@@ -358,232 +349,8 @@ fn iter_skip_next() {
     let _ = foo.filter().skip(42).next();
 }
 
-struct GetFalsePositive {
-    arr: [u32; 3],
-}
-
-impl GetFalsePositive {
-    fn get(&self, pos: usize) -> Option<&u32> { self.arr.get(pos) }
-    fn get_mut(&mut self, pos: usize) -> Option<&mut u32> { self.arr.get_mut(pos) }
-}
-
-/// Checks implementation of `GET_UNWRAP` lint
-fn get_unwrap() {
-    let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
-    let mut some_slice = &mut [0, 1, 2, 3];
-    let mut some_vec = vec![0, 1, 2, 3];
-    let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect();
-    let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]);
-    let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]);
-    let mut false_positive = GetFalsePositive { arr: [0, 1, 2] };
-
-    { // Test `get().unwrap()`
-        let _ = boxed_slice.get(1).unwrap();
-        let _ = some_slice.get(0).unwrap();
-        let _ = some_vec.get(0).unwrap();
-        let _ = some_vecdeque.get(0).unwrap();
-        let _ = some_hashmap.get(&1).unwrap();
-        let _ = some_btreemap.get(&1).unwrap();
-        let _ = false_positive.get(0).unwrap();
-    }
-
-    { // Test `get_mut().unwrap()`
-        *boxed_slice.get_mut(0).unwrap() = 1;
-        *some_slice.get_mut(0).unwrap() = 1;
-        *some_vec.get_mut(0).unwrap() = 1;
-        *some_vecdeque.get_mut(0).unwrap() = 1;
-        // Check false positives
-        *some_hashmap.get_mut(&1).unwrap() = 'b';
-        *some_btreemap.get_mut(&1).unwrap() = 'b';
-        *false_positive.get_mut(0).unwrap() = 1;
-    }
-}
-
-
 #[allow(similar_names)]
 fn main() {
-    use std::io;
-
     let opt = Some(0);
     let _ = opt.unwrap();
-
-    let res: Result<i32, ()> = Ok(0);
-    let _ = res.unwrap();
-
-    res.ok().expect("disaster!");
-    // the following should not warn, since `expect` isn't implemented unless
-    // the error type implements `Debug`
-    let res2: Result<i32, MyError> = Ok(0);
-    res2.ok().expect("oh noes!");
-    let res3: Result<u32, MyErrorWithParam<u8>>= Ok(0);
-    res3.ok().expect("whoof");
-    let res4: Result<u32, io::Error> = Ok(0);
-    res4.ok().expect("argh");
-    let res5: io::Result<u32> = Ok(0);
-    res5.ok().expect("oops");
-    let res6: Result<u32, &str> = Ok(0);
-    res6.ok().expect("meh");
-}
-
-struct MyError(()); // doesn't implement Debug
-
-#[derive(Debug)]
-struct MyErrorWithParam<T> {
-    x: T
-}
-
-#[allow(unnecessary_operation)]
-fn starts_with() {
-    "".chars().next() == Some(' ');
-    Some(' ') != "".chars().next();
-}
-
-fn str_extend_chars() {
-    let abc = "abc";
-    let def = String::from("def");
-    let mut s = String::new();
-
-    s.push_str(abc);
-    s.extend(abc.chars());
-
-    s.push_str("abc");
-    s.extend("abc".chars());
-
-    s.push_str(&def);
-    s.extend(def.chars());
-
-    s.extend(abc.chars().skip(1));
-    s.extend("abc".chars().skip(1));
-    s.extend(['a', 'b', 'c'].iter());
-
-    let f = HasChars;
-    s.extend(f.chars());
-}
-
-fn clone_on_copy() {
-    42.clone();
-
-    vec![1].clone(); // ok, not a Copy type
-    Some(vec![1]).clone(); // ok, not a Copy type
-    (&42).clone();
-}
-
-fn clone_on_ref_ptr() {
-    let rc = Rc::new(true);
-    let arc = Arc::new(true);
-
-    let rcweak = Rc::downgrade(&rc);
-    let arc_weak = Arc::downgrade(&arc);
-
-    rc.clone();
-    Rc::clone(&rc);
-
-    arc.clone();
-    Arc::clone(&arc);
-
-    rcweak.clone();
-    rc::Weak::clone(&rcweak);
-
-    arc_weak.clone();
-    sync::Weak::clone(&arc_weak);
-
-
-}
-
-fn clone_on_copy_generic<T: Copy>(t: T) {
-    t.clone();
-
-    Some(t).clone();
-}
-
-fn clone_on_double_ref() {
-    let x = vec![1];
-    let y = &&x;
-    let z: &Vec<_> = y.clone();
-
-    println!("{:p} {:p}",*y, z);
-}
-
-fn single_char_pattern() {
-    let x = "foo";
-    x.split("x");
-    x.split("xx");
-    x.split('x');
-
-    let y = "x";
-    x.split(y);
-    // Not yet testing for multi-byte characters
-    // Changing `r.len() == 1` to `r.chars().count() == 1` in `lint_single_char_pattern`
-    // should have done this but produced an ICE
-    //
-    // We may not want to suggest changing these anyway
-    // See: https://github.com/rust-lang-nursery/rust-clippy/issues/650#issuecomment-184328984
-    x.split("ß");
-    x.split("ℝ");
-    x.split("💣");
-    // Can't use this lint for unicode code points which don't fit in a char
-    x.split("❤️");
-    x.contains("x");
-    x.starts_with("x");
-    x.ends_with("x");
-    x.find("x");
-    x.rfind("x");
-    x.rsplit("x");
-    x.split_terminator("x");
-    x.rsplit_terminator("x");
-    x.splitn(0, "x");
-    x.rsplitn(0, "x");
-    x.matches("x");
-    x.rmatches("x");
-    x.match_indices("x");
-    x.rmatch_indices("x");
-    x.trim_left_matches("x");
-    x.trim_right_matches("x");
-
-    let h = HashSet::<String>::new();
-    h.contains("X"); // should not warn
-}
-
-#[allow(result_unwrap_used)]
-fn temporary_cstring() {
-    use std::ffi::CString;
-
-    CString::new("foo").unwrap().as_ptr();
-}
-
-fn iter_clone_collect() {
-    let v = [1,2,3,4,5];
-    let v2 : Vec<isize> = v.iter().cloned().collect();
-    let v3 : HashSet<isize> = v.iter().cloned().collect();
-    let v4 : VecDeque<isize> = v.iter().cloned().collect();
-}
-
-fn chars_cmp_with_unwrap() {
-    let s = String::from("foo");
-    if s.chars().next().unwrap() == 'f' { // s.starts_with('f')
-        // Nothing here
-    }
-    if s.chars().next_back().unwrap() == 'o' { // s.ends_with('o')
-        // Nothing here
-    }
-    if s.chars().last().unwrap() == 'o' { // s.ends_with('o')
-        // Nothing here
-    }
-    if s.chars().next().unwrap() != 'f' { // !s.starts_with('f')
-        // Nothing here
-    }
-    if s.chars().next_back().unwrap() != 'o' { // !s.ends_with('o')
-        // Nothing here
-    }
-    if s.chars().last().unwrap() != 'o' { // !s.ends_with('o')
-        // Nothing here
-    }
-}
-
-#[allow(unnecessary_operation)]
-fn ends_with() {
-    "".chars().last() == Some(' ');
-    Some(' ') != "".chars().last();
-    "".chars().next_back() == Some(' ');
-    Some(' ') != "".chars().next_back();
 }