async-trait 0.1.7

#![feature(async_await)]

use async_trait::async_trait;

#[async_trait]
trait Trait {
    type Assoc;

    async fn selfvalue(self)
    where
        Self: Sized,
    {
    }

    async fn selfref(&self) {}

    async fn selfmut(&mut self) {}

    async fn required() -> Self::Assoc;

    async fn elided_lifetime(_x: &str) {}

    async fn explicit_lifetime<'a>(_x: &'a str) {}

    async fn generic_type_param<T: Send>(x: Box<T>) -> T {
        *x
    }

    async fn calls(&self) {
        self.selfref().await;
        Self::elided_lifetime("").await;
        <Self>::elided_lifetime("").await;
    }

    async fn calls_mut(&mut self) {
        self.selfmut().await;
    }
}

struct Struct;

#[async_trait]
impl Trait for Struct {
    type Assoc = ();

    async fn selfvalue(self) {}

    async fn selfref(&self) {}

    async fn selfmut(&mut self) {}

    async fn required() -> Self::Assoc {}

    async fn elided_lifetime(_x: &str) {}

    async fn explicit_lifetime<'a>(_x: &'a str) {}

    async fn generic_type_param<T: Send>(x: Box<T>) -> T {
        *x
    }

    async fn calls(&self) {
        self.selfref().await;
        Self::elided_lifetime("").await;
        <Self>::elided_lifetime("").await;
    }

    async fn calls_mut(&mut self) {
        self.selfmut().await;
    }
}

pub async fn test() {
    let mut s = Struct;
    s.selfref().await;
    s.selfmut().await;
    s.selfvalue().await;

    Struct::required().await;
    Struct::elided_lifetime("").await;
    Struct::explicit_lifetime("").await;
    Struct::generic_type_param(Box::new("")).await;

    let mut s = Struct;
    s.calls().await;
    s.calls_mut().await;
}

pub async fn test_object_safe_without_default() {
    #[async_trait]
    trait ObjectSafe {
        async fn f(&self);
    }

    #[async_trait]
    impl ObjectSafe for Struct {
        async fn f(&self) {}
    }

    let object = &Struct as &dyn ObjectSafe;
    object.f().await;
}

pub async fn test_object_safe_with_default() {
    #[async_trait]
    trait ObjectSafe: Sync {
        async fn f(&self) {}
    }

    #[async_trait]
    impl ObjectSafe for Struct {
        async fn f(&self) {}
    }

    let object = &Struct as &dyn ObjectSafe;
    object.f().await;
}

pub async fn test_object_no_send() {
    #[async_trait(?Send)]
    trait ObjectSafe: Sync {
        async fn f(&self) {}
    }

    #[async_trait(?Send)]
    impl ObjectSafe for Struct {
        async fn f(&self) {}
    }

    let object = &Struct as &dyn ObjectSafe;
    object.f().await;
}

// https://github.com/dtolnay/async-trait/issues/1
mod issue1 {
    use async_trait::async_trait;

    #[async_trait]
    trait Issue1 {
        async fn f<U>(&self);
    }

    #[async_trait]
    impl<T: Sync> Issue1 for Vec<T> {
        async fn f<U>(&self) {}
    }
}

// https://github.com/dtolnay/async-trait/issues/2
mod issue2 {
    use async_trait::async_trait;
    use std::future::Future;

    #[async_trait]
    pub trait Issue2: Future {
        async fn flatten(self) -> <Self::Output as Future>::Output
        where
            Self::Output: Future + Send,
            Self: Sized,
        {
            let nested_future = self.await;
            nested_future.await
        }
    }
}

// https://github.com/dtolnay/async-trait/issues/9
mod issue9 {
    use async_trait::async_trait;

    #[async_trait]
    pub trait Issue9: Sized + Send {
        async fn f(_x: Self) {}
    }
}

// https://github.com/dtolnay/async-trait/issues/11
mod issue11 {
    use async_trait::async_trait;
    use std::sync::Arc;

    #[async_trait]
    trait Issue11 {
        async fn example(self: Arc<Self>);
    }

    struct Struct;

    #[async_trait]
    impl Issue11 for Struct {
        async fn example(self: Arc<Self>) {}
    }
}

// https://github.com/dtolnay/async-trait/issues/15
mod issue15 {
    use async_trait::async_trait;
    use std::marker::PhantomData;

    trait Trait {}

    #[async_trait]
    trait Issue15 {
        async fn myfn(&self, _: PhantomData<dyn Trait + Send>) {}
    }
}

// https://github.com/dtolnay/async-trait/issues/17
mod issue17 {
    use async_trait::async_trait;

    #[async_trait]
    trait Issue17 {
        async fn f(&self);
    }

    struct Struct {
        string: String,
    }

    #[async_trait]
    impl Issue17 for Struct {
        async fn f(&self) {
            println!("{}", self.string);
        }
    }
}