50 lines
1.2 KiB
Rust
50 lines
1.2 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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// If we use GEPi rather than GEP_tup_like when
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// storing closure data (as we used to do), the u64 would
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// overwrite the u16.
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#![allow(unknown_features)]
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#![feature(box_syntax)]
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struct Pair<A,B> {
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a: A, b: B
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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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trait Invokable<A> {
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fn f(&self) -> (A, 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>+'static> {
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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>+'static>)
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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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