19dcecb225
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`.
27 lines
845 B
Rust
27 lines
845 B
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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pub trait Foo for Sized? { fn foo<T>(&self, ext_thing: &T); }
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pub trait Bar for Sized?: Foo { }
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impl<T: Foo> Bar for T { }
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pub struct Thing;
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impl Foo for Thing {
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fn foo<T>(&self, _: &T) {}
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}
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#[inline(never)] fn foo(b: &Bar) { b.foo(&0u) }
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fn main() {
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let mut thing = Thing;
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let test: &Bar = &mut thing; //~ ERROR cannot convert to a trait object
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foo(test);
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}
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