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