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When using generators (or async) all type variables must be bound so a
generator can be constructed.
Erroneous code example:
```edition2018,compile_fail,E0698
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 generator can then be constructed:
```edition2018
async fn bar<T>() -> () {}
async fn foo() {
bar::<String>().await;
// ^^^^^^^^ specify type explicitly
}
```
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