40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
// Copyright 2018 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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// issue #46314
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#![feature(decl_macro)]
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#[derive(Debug)]
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struct NonCopy(String);
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struct Foo {
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x: NonCopy,
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}
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macro copy_modern($foo: ident) {
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$foo.x
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}
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macro_rules! copy_legacy {
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($foo: ident) => {
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$foo.x //~ ERROR use of moved value: `foo.x`
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}
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}
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fn assert_two_copies(a: NonCopy, b: NonCopy) {
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println!("Got two copies: {:?}, {:?}", a, b);
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}
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fn main() {
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let foo = Foo { x: NonCopy("foo".into()) };
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assert_two_copies(copy_modern!(foo), foo.x); //~ ERROR use of moved value: `foo.x`
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assert_two_copies(copy_legacy!(foo), foo.x); //~ ERROR use of moved value: `foo.x`
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}
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