rust/tests/ui/impl-trait/explicit-generic-args-with-impl-trait/explicit-generic-args-for-impl.rs

fn foo<T: ?Sized>(_f: impl AsRef<T>) {}

fn main() {
    foo::<str, String>("".to_string()); //~ ERROR E0107
}
Implement a `explicit_generic_args_with_impl_trait` feature gate When this gate is enabled, explicit generic arguments can be specified even if `impl Trait` is used in argument position. Generic arguments can only be specified for explicit generic parameters but not for the synthetic type parameters from `impl Trait` 2021-06-09 19:56:41 +00:00			`fn foo<T: ?Sized>(_f: impl AsRef<T>) {}`

			`fn main() {`
			`foo::<str, String>("".to_string()); //~ ERROR E0107`
			`}`