rust/tests/ui/cmp_owned.rs

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#![feature(plugin)]
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#![plugin(clippy)]
#[warn(cmp_owned)]
#[allow(unnecessary_operation)]
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fn main() {
fn with_to_string(x : &str) {
x != "foo".to_string();
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"foo".to_string() != x;
}
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let x = "oh";
with_to_string(x);
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x != "foo".to_owned();
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x != String::from("foo");
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42.to_string() == "42";
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Foo.to_owned() == Foo;
}
struct Foo;
impl PartialEq for Foo {
fn eq(&self, other: &Self) -> bool {
self.to_owned() == *other
}
}
impl ToOwned for Foo {
type Owned = Bar;
fn to_owned(&self) -> Bar {
Bar
}
}
#[derive(PartialEq)]
struct Bar;
impl PartialEq<Foo> for Bar {
fn eq(&self, _: &Foo) -> bool {
true
}
}
impl std::borrow::Borrow<Foo> for Bar {
fn borrow(&self) -> &Foo {
static FOO: Foo = Foo;
&FOO
}
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}