b53454e2e4
This commit moves reflection (as well as the {:?} format modifier) to a new
libdebug crate, all of which is marked experimental.
This is a breaking change because it now requires the debug crate to be
explicitly linked if the :? format qualifier is used. This means that any code
using this feature will have to add `extern crate debug;` to the top of the
crate. Any code relying on reflection will also need to do this.
Closes #12019
[breaking-change]
45 lines
1.0 KiB
Rust
45 lines
1.0 KiB
Rust
// Copyright 2012 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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extern crate debug;
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struct pair<A,B> {
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a: A, b: B
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}
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trait Invokable<A> {
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fn f(&self) -> (A, u16);
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}
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struct Invoker<A> {
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a: A,
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b: u16,
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}
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impl<A:Clone> Invokable<A> for Invoker<A> {
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fn f(&self) -> (A, u16) {
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(self.a.clone(), self.b)
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}
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}
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fn f<A:Clone + 'static>(a: A, b: u16) -> Box<Invokable<A>:> {
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box Invoker {
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a: a,
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b: b,
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} as Box<Invokable<A>>:
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}
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pub fn main() {
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let (a, b) = f(22_u64, 44u16).f();
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println!("a={:?} b={:?}", a, b);
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assert_eq!(a, 22u64);
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assert_eq!(b, 44u16);
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}
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