47 lines
1.7 KiB
Rust
47 lines
1.7 KiB
Rust
// Copyright 2016 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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#![feature(generic_param_attrs)]
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#![feature(dropck_eyepatch)]
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// This test ensures that a use of `#[may_dangle]` is rejected if
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// it is not attached to an `unsafe impl`.
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use std::fmt;
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struct Dt<A: fmt::Debug>(&'static str, A);
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struct Dr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
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struct Pt<A,B: fmt::Debug>(&'static str, A, B);
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struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(&'static str, &'a B, &'b B);
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struct St<A: fmt::Debug>(&'static str, A);
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struct Sr<'a, B:'a+fmt::Debug>(&'static str, &'a B);
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impl<A: fmt::Debug> Drop for Dt<A> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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impl<'a, B: fmt::Debug> Drop for Dr<'a, B> {
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); }
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}
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impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> {
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//~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute
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// (unsafe to access self.1 due to #[may_dangle] on A)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> {
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//~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute
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// (unsafe to access self.1 due to #[may_dangle] on 'a)
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fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); }
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}
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fn main() {
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}
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