| // run-pass |
| #![allow(dead_code)] |
| #![allow(unused_variables)] |
| // Test that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609). |
| |
| fn main() { |
| use std::cell::RefCell; |
| |
| struct S { |
| node: E, |
| } |
| |
| enum E { |
| Foo(u32), |
| Bar, |
| } |
| |
| // Check match |
| let x = RefCell::new(S { node: E::Foo(0) }); |
| |
| let mut b = x.borrow_mut(); |
| match b.node { |
| E::Foo(ref mut n) => *n += 1, |
| _ => (), |
| } |
| |
| // Check let |
| let x = RefCell::new(0); |
| let mut y = x.borrow_mut(); |
| let ref mut z = *y; |
| |
| fn foo(a: &mut RefCell<Option<String>>) { |
| if let Some(ref mut s) = *a.borrow_mut() { |
| s.push('a') |
| } |
| } |
| } |