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// Copyright 2015 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.
// Test that we give suitable error messages when the user attempts to
// impl a trait `Trait` for its own object type.
trait Foo { fn dummy(&self) { } }
trait Bar: Foo { }
trait Baz: Bar { }
// Subtraits of Baz are not legal:
impl Foo for Baz { } //~ ERROR E0371
impl Bar for Baz { } //~ ERROR E0371
impl Baz for Baz { } //~ ERROR E0371
// But other random traits are:
trait Other { }
impl Other for Baz { } // OK, Bar not a subtrait of Baz
// If the trait is not object-safe, we give a more tailored message
// because we're such schnuckels:
trait NotObjectSafe { fn eq(&self, other: Self); }
impl NotObjectSafe for NotObjectSafe { } //~ ERROR E0372
fn main() { }
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