rust/src/test/compile-fail/unboxed-closure-sugar-used-on-struct-1.rs

// Copyright 2014 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 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.


// Test that parentheses form doesn't work with struct types appearing in local variables.

struct Bar<A,R> {
    f: A, r: R
}

fn bar() {
    let x: Box<Bar()> = panic!();
    //~^ ERROR parenthesized parameters may only be used with a trait
}

fn main() { }