rust/tests/ui/use_self.rs

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2017-09-18 12:47:33 +02:00
#![warn(use_self)]
#![allow(dead_code)]
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#![allow(should_implement_trait)]
fn main() {}
mod use_self {
struct Foo {}
impl Foo {
fn new() -> Foo {
Foo {}
}
fn test() -> Foo {
Foo::new()
}
}
impl Default for Foo {
fn default() -> Foo {
Foo::new()
}
}
}
mod better {
struct Foo {}
impl Foo {
fn new() -> Self {
Self {}
}
fn test() -> Self {
Self::new()
}
}
impl Default for Foo {
fn default() -> Self {
Self::new()
}
}
}
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//todo the lint does not handle lifetimed struct
//the following module should trigger the lint on the third method only
mod lifetimes {
struct Foo<'a>{foo_str: &'a str}
impl<'a> Foo<'a> {
// Cannot use `Self` as return type, because the function is actually `fn foo<'b>(s: &'b str) -> Foo<'b>`
fn foo(s: &str) -> Foo {
Foo { foo_str: s }
}
// cannot replace with `Self`, because that's `Foo<'a>`
fn bar() -> Foo<'static> {
Foo { foo_str: "foo"}
}
// `Self` is applicable here
fn clone(&self) -> Foo<'a> {
Foo {foo_str: self.foo_str}
}
}
}