rust/src/test/compile-fail/unsafe-fn-autoderef.rs

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// -*- rust -*-
// 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.
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// xfail-test
type rec = {f: int};
fn f(p: *rec) -> int {
// Test that * ptrs do not autoderef. There is a deeper reason for
// prohibiting this, beyond making unsafe things annoying (which doesn't
// actually seem desirable to me). The deeper reason is that if you
// have a type like:
//
// enum foo = *foo;
//
// you end up with an infinite auto-deref chain, which is
// currently impossible (in all other cases, infinite auto-derefs
// are prohibited by various checks, such as that the enum is
// instantiable and so forth).
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return p.f; //~ ERROR attempted access of field `f` on type `*rec`
}
fn main() {
}