| // Copyright 2018 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. |
| |
| // Issue 27282: This is a variation on issue-27282-move-ref-mut-into-guard.rs |
| // |
| // It reborrows instead of moving the `ref mut` pattern borrow. This |
| // means that our conservative check for mutation in guards will |
| // reject it. But I want to make sure that we continue to reject it |
| // (under NLL) even when that conservaive check goes away. |
| |
| |
| #![feature(bind_by_move_pattern_guards)] |
| #![feature(nll)] |
| |
| fn main() { |
| let mut b = &mut true; |
| match b { |
| &mut false => {}, |
| ref mut r if { (|| { let bar = &mut *r; **bar = false; })(); |
| //~^ ERROR cannot borrow `r` as mutable, as it is immutable for the pattern guard |
| false } => { &mut *r; }, |
| &mut true => { println!("You might think we should get here"); }, |
| _ => panic!("surely we could never get here, since rustc warns it is unreachable."), |
| } |
| } |
