45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
// Copyright 2015 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 that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609).
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fn main() {
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use std::cell::RefCell;
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struct S {
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node: E,
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}
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enum E {
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Foo(u32),
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Bar,
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}
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// Check match
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let x = RefCell::new(S { node: E::Foo(0) });
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let mut b = x.borrow_mut();
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match b.node {
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E::Foo(ref mut n) => *n += 1,
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_ => (),
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}
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// Check let
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let x = RefCell::new(0);
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let mut y = x.borrow_mut();
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let ref mut z = *y;
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fn foo(a: &mut RefCell<Option<String>>) {
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if let Some(ref mut s) = *a.borrow_mut() {
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s.push('a')
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}
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}
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}
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