55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
// Copyright 2016 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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// compile-flags:-Zborrowck=mir -Zverbose
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#![allow(warnings)]
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#![feature(rustc_attrs)]
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use std::cell::Cell;
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// Invoke in such a way that the callee knows:
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//
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// - 'a: 'x
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//
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// and it must prove that `T: 'x`. Callee passes along `T: 'a`.
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fn twice<'a, F, T>(v: Cell<&'a ()>, value: T, mut f: F)
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where
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F: for<'x> FnMut(Option<Cell<&'a &'x ()>>, &T),
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{
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f(None, &value);
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f(None, &value);
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}
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#[rustc_regions]
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fn generic<T>(value: T) {
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let cell = Cell::new(&());
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twice(cell, value, |a, b| invoke(a, b));
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//~^ WARNING not reporting region error
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//
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// This error from the old region solver looks bogus.
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}
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#[rustc_regions]
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fn generic_fail<'a, T>(cell: Cell<&'a ()>, value: T) {
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twice(cell, value, |a, b| invoke(a, b));
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//~^ WARNING not reporting region error
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//~| WARNING not reporting region error
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//~| ERROR the parameter type `T` may not live long enough
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}
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fn invoke<'a, 'x, T>(x: Option<Cell<&'x &'a ()>>, y: &T)
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where
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T: 'x,
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{
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}
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fn main() {}
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