| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![feature(generic_associated_types)] |
| |
| //FIXME(#44265): "type parameter not allowed" errors will be addressed in a follow-up PR |
| |
| use std::rc::Rc; |
| use std::sync::Arc; |
| use std::ops::Deref; |
| |
| trait PointerFamily { |
| type Pointer<T>: Deref<Target = T>; |
| fn new<T>(value: T) -> Self::Pointer<T>; |
| //~^ ERROR type parameters are not allowed on this type [E0109] |
| } |
| |
| struct ArcFamily; |
| |
| impl PointerFamily for ArcFamily { |
| type Pointer<T> = Arc<T>; |
| fn new<T>(value: T) -> Self::Pointer<T> { |
| //~^ ERROR type parameters are not allowed on this type [E0109] |
| Arc::new(value) |
| } |
| } |
| |
| struct RcFamily; |
| |
| impl PointerFamily for RcFamily { |
| type Pointer<T> = Rc<T>; |
| fn new<T>(value: T) -> Self::Pointer<T> { |
| //~^ ERROR type parameters are not allowed on this type [E0109] |
| Rc::new(value) |
| } |
| } |
| |
| struct Foo<P: PointerFamily> { |
| bar: P::Pointer<String>, |
| //~^ ERROR type parameters are not allowed on this type [E0109] |
| } |
| |
| fn main() {} |