46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
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// Copyright 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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// Issue #12856: a lifetime formal binding introduced by a generic fn
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// should not upset the variance inference for actual occurrences of
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// that lifetime in type expressions.
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trait HasLife<'a> { }
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trait UseLife01 {
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fn refs<'a, H: HasLife<'a>>(&'a self) -> H;
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}
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trait UseLife02 {
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fn refs<'a, T, H: HasType<&'a T>>(&'a self) -> H;
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}
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trait HasType<T> { }
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trait UseLife03<T> {
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fn refs<'a, H: HasType<&'a T>>(&'a self) -> H;
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}
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// (The functions below were not actually a problem observed during
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// fixing of #12856; they just seem like natural tests to put in to
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// cover a couple more points in the testing space)
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pub fn top_refs_1<'a, H: HasLife<'a>>(_s: &'a ()) -> H {
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unimplemented!()
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}
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pub fn top_refs_2<'a, T, H: HasType<&'a T>>(_s: &'a ()) -> H {
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unimplemented!()
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}
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pub fn main() {}
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