An async trait mock won't compile in 0.10.1 but did in 0.9

[Sushisource]

This looks nearly identical to #298 but I'm using 0.10.1 and still getting the error. My trait and the manual mock:

pub type Result<T, E = tonic::Status> = std::result::Result<T, E>;

#[cfg_attr(test, mockall::automock)]
#[async_trait::async_trait]
pub trait Poller<PollResult>
where
    PollResult: Send + Sync + 'static,
{
    async fn poll(&self) -> Option<Result<PollResult>>;
    fn notify_shutdown(&self);
    async fn shutdown(self);
    async fn shutdown_box(self: Box<Self>);
}

#[cfg(test)]
mockall::mock! {
    pub ManualPoller<T: Send + Sync + 'static> {}
    impl<T: Send + Sync + 'static> Poller<T> for ManualPoller<T> {
        fn poll<'a, 'b>(&'a self)
          -> impl Future<Output = Option<Result<T>>> + Send + 'b
            where 'a: 'b, Self: 'b;
        fn notify_shutdown(&self);
        fn shutdown<'a>(self)
          -> impl Future<Output = ()> + Send + 'a
            where Self: 'a;
        fn shutdown_box<'a>(self: Box<Self>)
          -> impl Future<Output = ()> + Send + 'a
            where Self: 'a;
    }
}

error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
  --> src/pollers/mod.rs:43:1
   |
43 | / mockall::mock! {
44 | |     pub ManualPoller<T: Send + Sync + 'static> {}
45 | |     impl<T: Send + Sync + 'static> Poller<T> for ManualPoller<T> {
46 | |         fn poll<'a, 'b>(&'a self)
...  |
56 | |     }
57 | | }
   | | ^
   | | |
   | |_this data with an anonymous lifetime `'_`...
   |   ...is captured and required to live as long as `'static` here

[asomers]

Did this work on 0.9.1 ?

[Sushisource]

@asomers Indeed it did

[asomers]

The problem is caused by mocking a trait method that returns a non-static structure on a generic struct. That conflicts with the specific impl code from PR #274 . You wouldn't have a problem if:

• poll were a struct method instead of a trait method,
• poll's return value were always `'static, or
• ManualPoller weren't generic.

This is fixable, but it might take some time.

[asomers]

@Sushisource could you please test the branch in the linked PR?

[Sushisource]

@asomers Yep, that's worked for me. Thanks!

[asomers]

Just released 0.10.2 . Thanks for the bug report!