rust/src/test/compile-fail/object-safety-generics.rs
Niko Matsakis 19dcecb225 Refactor object-safety into its own (cached) module so that we can
check it more easily; also extend object safety to cover sized types
as well as static methods.  This makes it sufficient so that we can
always ensure that `Foo : Foo` holds for any trait `Foo`.
2015-01-02 12:08:36 -05:00

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Rust

// Copyright 2014 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.
// Check that we correctly prevent users from making trait objects
// from traits with generic methods.
trait Bar {
fn bar<T>(&self, t: T);
}
fn make_bar<T:Bar>(t: &T) -> &Bar {
t
//~^ ERROR `Bar` is not object-safe
//~| NOTE method `bar` has generic type parameters
}
fn make_bar_explicit<T:Bar>(t: &T) -> &Bar {
t as &Bar
//~^ ERROR `Bar` is not object-safe
//~| NOTE method `bar` has generic type parameters
}
fn main() {
}