Type annotations about async-stream HOT 4 OPEN

I managed to annotate the return type by writing this:

let stream = try_stream! {
    //...
};
let _: &dyn Stream<Item=Result<_, MyError>> = &stream;

Not the prettiest code, but it gets the job done and looks better than the auxiliary function.
I've checked the generated assembly and it has zero cost.

from async-stream.

I don't see you yielding anywhere in this example.

from async-stream.

Unfortunately, "terrible compilation errors" is going to be a limitation of this crate & the macro strategy. Doing better on the compilation error front will require rustc to provide stream generators.

Sorry :(

from async-stream.

Sorry, the yield was in the part that was omitted in the error message 🙂

Sure, that's fine, I just wondered whether there's an easy way to annotate the return type, so that I won't have to create a helper function. But helper functions work just fine.

from async-stream.