| // Issue 27282: Example 2: This sidesteps the AST checks disallowing |
| // mutable borrows in match guards by hiding the mutable borrow in a |
| // guard behind a move (of the mutably borrowed match input) within a |
| // closure. |
| // |
| // This example is not rejected by AST borrowck (and then reliably |
| // reaches the panic code when executed, despite the compiler warning |
| // about that match arm being unreachable. |
| |
| #![feature(if_let_guard)] |
| |
| fn main() { |
| let b = &mut true; |
| match b { |
| //~^ ERROR use of moved value: `b` [E0382] |
| &mut false => {}, |
| _ if { (|| { let bar = b; *bar = false; })(); |
| false } => { }, |
| &mut true => { println!("You might think we should get here"); }, |
| _ => panic!("surely we could never get here, since rustc warns it is unreachable."), |
| } |
| |
| let b = &mut true; |
| match b { |
| //~^ ERROR use of moved value: `b` [E0382] |
| &mut false => {} |
| _ if let Some(()) = { |
| (|| { let bar = b; *bar = false; })(); |
| None |
| } => {} |
| &mut true => {} |
| _ => {} |
| } |
| } |
