rust/tests/ui/ptr_arg.rs

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#![allow(unused, many_single_char_names)]
#![warn(ptr_arg)]
use std::borrow::Cow;
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fn do_vec(x: &Vec<i64>) {
//Nothing here
}
fn do_vec_mut(x: &mut Vec<i64>) { // no error here
//Nothing here
}
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fn do_str(x: &String) {
//Nothing here either
}
fn do_str_mut(x: &mut String) { // no error here
//Nothing here either
}
fn main() {
}
trait Foo {
type Item;
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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 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]>) {
}
#[allow(dead_code)]
fn test_cow(c: Cow<[i32]>) {
let _c = c;
}