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Fix a bug in the opt-in-copy work: it was failing to liberate the reg…
…ions bound in the impl before searching for `Copy` implements for all fields, leading to problems in the "copyability check". Basically the copyability check would wind up looking for an impl of `for<'tcx> Foo<&'tcx T>`. The impl that exists however is `impl<T> Copy for Foo<T>` and the current rules do not consider that a match (something I would like to revise in a later PR).
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// Test that we handle binder levels correctly when checking whether a | ||
// type can implement `Copy`. In particular, we had a bug where we failed to | ||
// liberate the late-bound regions from the impl, and thus wound up | ||
// searching for an impl of `for<'tcx> Foo<&'tcx T>`. The impl that | ||
// exists however is `impl<T> Copy for Foo<T>` and the current rules | ||
// did not consider that a match (something I would like to revise in | ||
// a later PR). | ||
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#![allow(dead_code)] | ||
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use std::kinds::marker; | ||
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#[deriving(Copy)] | ||
struct Foo<T> { x: T } | ||
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type Ty<'tcx> = &'tcx TyS<'tcx>; | ||
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enum TyS<'tcx> { | ||
Boop(marker::InvariantLifetime<'tcx>) | ||
} | ||
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enum Bar<'tcx> { | ||
Baz(Foo<Ty<'tcx>>) | ||
} | ||
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impl<'tcx> Copy for Bar<'tcx> { } | ||
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fn main() { } |