#[future] with type constraint of impl Trait supported?

[arichtman]

Hi all - thanks so much for your crate and time 🙏🏼

From the code it looks like the #[future] macro should support impl Trait, yet I get a macro error. Expanded version works fine so the end is valid Rust. Not sure if this is intended to be supported though.

rstest/rstest_macros/src/parse/future.rs

Line 104 in e0b735e

| ImplTrait(_)

[la10736]

Ok, maybe with the current implementation accept the ImplTrait is an error because the implementation doesn't take it in account. The correct implementation should be implement the impl syntactic sugar by add a new generic.

Thanks for reporting it.

Workaround

#[rstest]
#[tokio::test]
async fn rubbish<S: StateTrait>(#[future] common_state: S) -> () {} 

About the macro order: if you put #[tokio::test] before #[rstest] you're precluding the possibility to add cases, values and files.

[arichtman]

Thanks! That's sorted me - I'll leave the issue for you to manage as you like :)