4459a438c2
includes regression tests discovered during bootstrapping and tests of cyclic structure that currently pass and are expected to continue passing under the dropck rule. (Note that all the uses of `unsafe_destructor` are just placating the simple analysis used for that feature, which will eventually go away once we have put the dropck through its paces.)
44 lines
1.1 KiB
Rust
44 lines
1.1 KiB
Rust
// Copyright 2012-2014 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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// This is a regression test for something that only came up while
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// attempting to bootstrap libsyntax; it is adapted from
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// `syntax::ext::tt::generic_extension`.
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pub struct E<'a> {
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pub f: &'a u8,
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}
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impl<'b> E<'b> {
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pub fn m(&self) -> &'b u8 { self.f }
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}
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pub struct P<'c> {
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pub g: &'c u8,
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}
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pub trait M {
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fn n(&self) -> u8;
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}
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impl<'d> M for P<'d> {
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fn n(&self) -> u8 { *self.g }
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}
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fn extension<'e>(x: &'e E<'e>) -> Box<M+'e> {
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loop {
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let p = P { g: x.m() };
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return Box::new(p) as Box<M+'e>;
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}
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}
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fn main() {
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let w = E { f: &10u8 };
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let o = extension(&w);
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assert_eq!(o.n(), 10u8);
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}
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