83 lines
1.7 KiB
Rust
83 lines
1.7 KiB
Rust
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#![warn(needless_pass_by_value)]
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#![allow(dead_code, single_match, if_let_redundant_pattern_matching, many_single_char_names)]
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use std::borrow::Borrow;
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use std::convert::AsRef;
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// `v` should be warned
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// `w`, `x` and `y` are allowed (moved or mutated)
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fn foo<T: Default>(v: Vec<T>, w: Vec<T>, mut x: Vec<T>, y: Vec<T>) -> Vec<T> {
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assert_eq!(v.len(), 42);
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consume(w);
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x.push(T::default());
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y
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}
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fn consume<T>(_: T) {}
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struct Wrapper(String);
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fn bar(x: String, y: Wrapper) {
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assert_eq!(x.len(), 42);
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assert_eq!(y.0.len(), 42);
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}
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// V implements `Borrow<V>`, but should be warned correctly
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fn test_borrow_trait<T: Borrow<str>, U: AsRef<str>, V>(t: T, u: U, v: V) {
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println!("{}", t.borrow());
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println!("{}", u.as_ref());
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consume(&v);
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}
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// ok
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fn test_fn<F: Fn(i32) -> i32>(f: F) {
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f(1);
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}
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// x should be warned, but y is ok
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fn test_match(x: Option<Option<String>>, y: Option<Option<String>>) {
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match x {
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Some(Some(_)) => 1, // not moved
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_ => 0,
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};
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match y {
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Some(Some(s)) => consume(s), // moved
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_ => (),
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};
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}
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// x and y should be warned, but z is ok
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fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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let Wrapper(s) = z; // moved
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let Wrapper(ref t) = y; // not moved
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let Wrapper(_) = y; // still not moved
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assert_eq!(x.0.len(), s.len());
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println!("{}", t);
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}
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trait Foo {}
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// `S: Serialize` can be passed by value
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trait Serialize {}
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impl<'a, T> Serialize for &'a T where T: Serialize {}
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impl Serialize for i32 {}
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fn test_blanket_ref<T: Foo, S: Serialize>(_foo: T, _serializable: S) {}
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fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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s.capacity();
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let _ = t.clone();
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u.capacity();
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let _ = v.clone();
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}
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fn main() {}
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