158 lines
3.6 KiB
Rust
158 lines
3.6 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![warn(clippy::needless_pass_by_value)]
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#![allow(dead_code, clippy::single_match, clippy::redundant_pattern_matching, clippy::many_single_char_names, clippy::option_option)]
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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` is allowed to be passed by value, since a caller can pass `&S` instead
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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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struct S<T, U>(T, U);
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impl<T: Serialize, U> S<T, U> {
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fn foo(
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self, // taking `self` by value is always allowed
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s: String,
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t: String,
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) -> usize {
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s.len() + t.capacity()
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}
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fn bar(
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_t: T, // Ok, since `&T: Serialize` too
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) {
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}
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fn baz(
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&self,
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_u: U,
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_s: Self,
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) {
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}
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}
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trait FalsePositive {
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fn visit_str(s: &str);
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fn visit_string(s: String) {
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Self::visit_str(&s);
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}
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}
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// shouldn't warn on extern funcs
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extern "C" fn ext(x: String) -> usize { x.len() }
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// whitelist RangeArgument
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fn range<T: ::std::ops::RangeBounds<usize>>(range: T) {
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let _ = range.start_bound();
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}
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struct CopyWrapper(u32);
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fn bar_copy(x: u32, y: CopyWrapper) {
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assert_eq!(x, 42);
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assert_eq!(y.0, 42);
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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_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
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let CopyWrapper(s) = z; // moved
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let CopyWrapper(ref t) = y; // not moved
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let CopyWrapper(_) = y; // still not moved
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assert_eq!(x.0, s);
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println!("{}", t);
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}
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// The following 3 lines should not cause an ICE. See #2831
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trait Bar<'a, A> {}
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impl<'b, T> Bar<'b, T> for T {}
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fn some_fun<'b, S: Bar<'b, ()>>(_item: S) {}
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// Also this should not cause an ICE. See #2831
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trait Club<'a, A> {}
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impl<T> Club<'static, T> for T {}
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fn more_fun(_item: impl Club<'static, i32>) {}
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fn main() {}
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