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#![feature(type_alias_impl_trait)] pub trait Backend {} impl Backend for () {} pub struct Module<T>(T); pub type BackendImpl = impl Backend; pub fn make_module() -> Module<BackendImpl> { Module(()) }
$ rustc -V rustc 1.38.0 (625451e37 2019-09-23) $ cargo doc error[E0282]: type annotations needed --> src/main.rs:13:1 | 13 | pub type BackendImpl = impl Backend<Product: std::any::Any>; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type error: aborting due to previous error $ cargo build