Error code E0698
Note: this error code is no longer emitted by the compiler.
When using coroutines (or async) all type variables must be bound so a coroutine can be constructed.
Erroneous code example:
#![allow(unused)] fn main() { async fn bar<T>() -> () {} async fn foo() { bar().await; // error: cannot infer type for `T` } }
In the above example T
is unknowable by the compiler.
To fix this you must bind T
to a concrete type such as String
so that a coroutine can then be constructed:
#![allow(unused)] fn main() { async fn bar<T>() -> () {} async fn foo() { bar::<String>().await; // ^^^^^^^^ specify type explicitly } }