| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Test closure that: |
| // |
| // - takes an argument `y` |
| // - stores `y` into another, longer-lived spot |
| // |
| // but is invoked with a spot that doesn't live long |
| // enough to store `y`. |
| // |
| // The error is reported in the caller: invoking the closure links the |
| // lifetime of the variable that is given as `y` (via subtyping) and |
| // thus forces the corresponding borrow to live too long. This is |
| // basically checking that the MIR type checker correctly enforces the |
| // closure signature. |
| |
| // compile-flags:-Zborrowck=mir -Zverbose |
| |
| #![feature(rustc_attrs)] |
| |
| #[rustc_regions] |
| fn test() { |
| let x = 44; |
| let mut p = &x; |
| |
| { |
| let y = 22; |
| let mut closure = expect_sig(|p, y| *p = y); |
| closure(&mut p, &y); |
| //~^ ERROR `y` does not live long enough [E0597] |
| } |
| |
| deref(p); |
| } |
| |
| fn expect_sig<F>(f: F) -> F |
| where F: for<'a, 'b> FnMut(&'a mut &'b i32, &'b i32) |
| { |
| f |
| } |
| |
| fn deref(_p: &i32) { } |
| |
| fn main() { } |