src/test/ui/rfc1598-generic-associated-types/pointer_family.rs

// 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)]
//~^ WARNING the feature `generic_associated_types` is incomplete

// 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() {}