39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
// Copyright 2017 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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// Test an interesting corner case: a fn that takes two arguments that
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// are references with the same lifetime is in fact equivalent to a fn
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// that takes two references with distinct lifetimes. This is true
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// because the two functions can call one another -- effectively, the
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// single lifetime `'a` is just inferred to be the intersection of the
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// two distinct lifetimes.
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//
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// compile-flags:-Zno-leak-check
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#![feature(nll)]
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use std::cell::Cell;
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fn make_cell_aa() -> Cell<for<'a> fn(&'a u32, &'a u32)> {
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panic!()
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}
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fn aa_eq_ab() {
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let a: Cell<for<'a, 'b> fn(&'a u32, &'b u32)> = make_cell_aa();
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//~^ ERROR higher-ranked subtype error
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//
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// FIXME -- this .. arguably ought to be accepted. However, the
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// current leak check also rejects this example, and it's kind of
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// a pain to support it. There are some comments in `relate_tys`
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drop(a);
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}
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fn main() { }
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