65 lines
1.9 KiB
Rust
65 lines
1.9 KiB
Rust
// Copyright 2015 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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// check that static methods don't get to assume their trait-ref
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// is well-formed.
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// FIXME(#27579): this is just a bug. However, our checking with
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// static inherent methods isn't quite working - need to
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// fix that before removing the check.
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trait Foo<'a, 'b, T>: Sized {
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fn make_me() -> Self { loop {} }
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fn static_evil(u: &'b u32) -> &'a u32;
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}
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struct Evil<'a, 'b: 'a>(Option<&'a &'b ()>);
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impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
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fn make_me() -> Self { }
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fn static_evil(u: &'b u32) -> &'a u32 {
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u //~ ERROR E0312
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}
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}
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struct IndirectEvil<'a, 'b: 'a>(Option<&'a &'b ()>);
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impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
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fn make_me() -> Self { IndirectEvil(None) }
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fn static_evil(u: &'b u32) -> &'a u32 {
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let me = Self::make_me(); //~ ERROR lifetime bound not satisfied
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loop {} // (`me` could be used for the lifetime transmute).
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}
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}
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impl<'a, 'b> Evil<'a, 'b> {
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fn inherent_evil(u: &'b u32) -> &'a u32 {
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u //~ ERROR E0312
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}
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}
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// while static methods don't get to *assume* this, we still
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// *check* that they hold.
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fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
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<()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime
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}
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fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
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<IndirectEvil>::static_evil(b)
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//~^ ERROR cannot infer an appropriate lifetime
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}
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fn inherent_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
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<Evil>::inherent_evil(b) // bug? shouldn't this be an error
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}
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fn main() {}
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