48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
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// 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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// Test a case where we fail to approximate one of the regions and
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// hence report an error while checking the closure.
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// compile-flags:-Znll -Zborrowck=mir -Zverbose
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#![feature(rustc_attrs)]
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use std::cell::Cell;
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// Callee knows that:
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//
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// 'b: 'y
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//
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// but this doesn't really help us in proving that `'x: 'y`, so closure gets an error.
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fn establish_relationships<'a, 'b, F>(_cell_a: &Cell<&'a u32>, _cell_b: &Cell<&'b u32>, _closure: F)
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where
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F: for<'x, 'y> FnMut(
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&Cell<&'y &'b u32>, // shows that 'b: 'y
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&Cell<&'x u32>,
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&Cell<&'y u32>,
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),
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{
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}
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fn demand_y<'x, 'y>(_cell_x: &Cell<&'x u32>, _cell_y: &Cell<&'y u32>, _y: &'y u32) {}
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#[rustc_regions]
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fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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// Only works if 'x: 'y:
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demand_y(x, y, x.get())
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//~^ WARN not reporting region error due to -Znll
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//~| ERROR free region `'_#6r` does not outlive free region `'_#4r`
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});
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}
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fn main() {}
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