de0906fe12
This was causing terrible error reports, because the algorithm was incorrectly identifying the constraints.
37 lines
1.2 KiB
Rust
37 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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// This test checks that the error messages you get for this example
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// at least mention `'a` and `'static`. The precise messages can drift
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// over time, but this test used to exhibit some pretty bogus messages
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// that were not remotely helpful.
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// error-pattern:cannot infer
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// error-pattern:cannot outlive the lifetime 'a
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// error-pattern:must be valid for the static lifetime
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// error-pattern:cannot infer
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// error-pattern:cannot outlive the lifetime 'a
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// error-pattern:must be valid for the static lifetime
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struct Invariant<'a>(Option<&'a mut &'a mut ()>);
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fn mk_static() -> Invariant<'static> { Invariant(None) }
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fn unify<'a>(x: Option<Invariant<'a>>, f: fn(Invariant<'a>)) {
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let bad = if x.is_some() {
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x.unwrap()
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} else {
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mk_static()
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};
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f(bad);
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}
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fn main() {}
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