New upstream version 1.52.1+dfsg1

[rustc.git] / src / tools / clippy / tests / ui / ptr_arg.rs

diff --git a/src/tools/clippy/tests/ui/ptr_arg.rs b/src/tools/clippy/tests/ui/ptr_arg.rs
new file mode 100644 (file)
index 0000000..06370df
--- /dev/null
+++ b/src/tools/clippy/tests/ui/ptr_arg.rs
@@ -0,0 +1,157 @@
+#![allow(unused, clippy::many_single_char_names, clippy::redundant_clone)]
+#![warn(clippy::ptr_arg)]
+
+use std::borrow::Cow;
+use std::path::PathBuf;
+
+fn do_vec(x: &Vec<i64>) {
+    //Nothing here
+}
+
+fn do_vec_mut(x: &mut Vec<i64>) {
+    // no error here
+    //Nothing here
+}
+
+fn do_str(x: &String) {
+    //Nothing here either
+}
+
+fn do_str_mut(x: &mut String) {
+    // no error here
+    //Nothing here either
+}
+
+fn do_path(x: &PathBuf) {
+    //Nothing here either
+}
+
+fn do_path_mut(x: &mut PathBuf) {
+    // no error here
+    //Nothing here either
+}
+
+fn main() {}
+
+trait Foo {
+    type Item;
+    fn do_vec(x: &Vec<i64>);
+    fn do_item(x: &Self::Item);
+}
+
+struct Bar;
+
+// no error, in trait impl (#425)
+impl Foo for Bar {
+    type Item = Vec<u8>;
+    fn do_vec(x: &Vec<i64>) {}
+    fn do_item(x: &Vec<u8>) {}
+}
+
+fn cloned(x: &Vec<u8>) -> Vec<u8> {
+    let e = x.clone();
+    let f = e.clone(); // OK
+    let g = x;
+    let h = g.clone(); // Alas, we cannot reliably detect this without following data.
+    let i = (e).clone();
+    x.clone()
+}
+
+fn str_cloned(x: &String) -> String {
+    let a = x.clone();
+    let b = x.clone();
+    let c = b.clone();
+    let d = a.clone().clone().clone();
+    x.clone()
+}
+
+fn path_cloned(x: &PathBuf) -> PathBuf {
+    let a = x.clone();
+    let b = x.clone();
+    let c = b.clone();
+    let d = a.clone().clone().clone();
+    x.clone()
+}
+
+fn false_positive_capacity(x: &Vec<u8>, y: &String) {
+    let a = x.capacity();
+    let b = y.clone();
+    let c = y.as_str();
+}
+
+fn false_positive_capacity_too(x: &String) -> String {
+    if x.capacity() > 1024 {
+        panic!("Too large!");
+    }
+    x.clone()
+}
+
+#[allow(dead_code)]
+fn test_cow_with_ref(c: &Cow<[i32]>) {}
+
+fn test_cow(c: Cow<[i32]>) {
+    let _c = c;
+}
+
+trait Foo2 {
+    fn do_string(&self);
+}
+
+// no error for &self references where self is of type String (#2293)
+impl Foo2 for String {
+    fn do_string(&self) {}
+}
+
+// Check that the allow attribute on parameters is honored
+mod issue_5644 {
+    use std::borrow::Cow;
+    use std::path::PathBuf;
+
+    fn allowed(
+        #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+        #[allow(clippy::ptr_arg)] _s: &String,
+        #[allow(clippy::ptr_arg)] _p: &PathBuf,
+        #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+    ) {
+    }
+
+    struct S {}
+    impl S {
+        fn allowed(
+            #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+            #[allow(clippy::ptr_arg)] _s: &String,
+            #[allow(clippy::ptr_arg)] _p: &PathBuf,
+            #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+        ) {
+        }
+    }
+
+    trait T {
+        fn allowed(
+            #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+            #[allow(clippy::ptr_arg)] _s: &String,
+            #[allow(clippy::ptr_arg)] _p: &PathBuf,
+            #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+        ) {
+        }
+    }
+}
+
+mod issue6509 {
+    use std::path::PathBuf;
+
+    fn foo_vec(vec: &Vec<u8>) {
+        let _ = vec.clone().pop();
+        let _ = vec.clone().clone();
+    }
+
+    fn foo_path(path: &PathBuf) {
+        let _ = path.clone().pop();
+        let _ = path.clone().clone();
+    }
+
+    fn foo_str(str: &PathBuf) {
+        let _ = str.clone().pop();
+        let _ = str.clone().clone();
+    }
+}