49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
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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// Forbid assignment into a dynamically sized type.
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struct Fat<T: ?Sized> {
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f1: isize,
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f2: &'static str,
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ptr: T
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}
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#[derive(PartialEq,Eq)]
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struct Bar;
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#[derive(PartialEq,Eq)]
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struct Bar1 {
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f: isize
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}
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trait ToBar {
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fn to_bar(&self) -> Bar;
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fn to_val(&self) -> isize;
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}
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impl ToBar for Bar1 {
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fn to_bar(&self) -> Bar {
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Bar
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}
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fn to_val(&self) -> isize {
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self.f
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}
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}
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pub fn main() {
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// Assignment.
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let f5: &mut Fat<ToBar> = &mut Fat { f1: 5, f2: "some str", ptr: Bar1 {f :42} };
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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let z: Box<ToBar> = Box::new(Bar1 {f: 36});
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f5.ptr = *z;
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//~^ ERROR `ToBar: std::marker::Sized` is not satisfied
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}
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