33 lines
982 B
Rust
33 lines
982 B
Rust
// Copyright 2017 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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use std::fmt;
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fn foo() -> Box<impl fmt::Debug+?Sized> {
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let x : Box<[u8]> = Box::new([0]);
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x
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}
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fn bar() -> Box<impl fmt::Debug+?Sized> {
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let y: Box<fmt::Debug> = Box::new([0]);
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y
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}
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fn main() {
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let f = foo();
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let b = bar();
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// this is an `*mut [u8]` in practice
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let f_raw : *mut _ = Box::into_raw(f);
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// this is an `*mut fmt::Debug` in practice
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let mut b_raw = Box::into_raw(b);
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// ... and they should not be mixable
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b_raw = f_raw as *mut _; //~ ERROR is invalid
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}
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