| // Copyright 2017 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. |
| |
| // This is a test of the borrowck migrate mode. It leverages #27282, a |
| // bug that is fixed by NLL: this code is (unsoundly) accepted by |
| // AST-borrowck, but is correctly rejected by the NLL borrowck. |
| // |
| // Therefore, for backwards-compatiblity, under borrowck=migrate the |
| // NLL checks will be emitted as *warnings*. |
| |
| // NLL mode makes this compile-fail; we cannot currently encode a |
| // test that is run-pass or compile-fail based on compare-mode. So |
| // just ignore it instead: |
| |
| // ignore-compare-mode-nll |
| |
| // revisions: zflag edition |
| //[zflag]compile-flags: -Z borrowck=migrate |
| //[edition]edition:2018 |
| //[zflag] run-pass |
| //[edition] run-pass |
| |
| fn main() { |
| match Some(&4) { |
| None => {}, |
| ref mut foo |
| if { |
| (|| { let bar = foo; bar.take() })(); |
| false |
| } => {}, |
| Some(ref _s) => println!("Note this arm is bogus; the `Some` became `None` in the guard."), |
| _ => println!("Here is some supposedly unreachable code."), |
| } |
| } |