42 lines
1.2 KiB
Rust
42 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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// Check that we correctly infer that b and c must be region
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// parameterized because they reference a which requires a region.
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type a<'a> = &'a isize;
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type b<'a> = Box<a<'a>>;
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struct c<'a> {
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f: Box<b<'a>>
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}
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trait set_f<'a> {
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fn set_f_ok(&mut self, b: Box<b<'a>>);
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fn set_f_bad(&mut self, b: Box<b>);
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}
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impl<'a> set_f<'a> for c<'a> {
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fn set_f_ok(&mut self, b: Box<b<'a>>) {
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self.f = b;
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}
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fn set_f_bad(&mut self, b: Box<b>) {
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self.f = b;
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//~^ ERROR mismatched types
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//~| expected type `std::boxed::Box<std::boxed::Box<&'a isize>>`
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//~| found type `std::boxed::Box<std::boxed::Box<&isize>>`
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//~| lifetime mismatch
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}
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}
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fn main() {}
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