// Copyright 2012 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. struct X { x: ~str, } impl Drop for X { fn finalize(&self) { error!("value: %s", self.x); } } fn unwrap(x: X) -> ~str { let X { x: y } = x; //~ ERROR deconstructing struct not allowed in pattern y } fn main() { let x = X { x: ~"hello" }; let y = unwrap(x); error!("contents: %s", y); }