rust/src/test/compile-fail/issue-2149.rs

// 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 <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.

trait vec_monad<A> {
    fn bind<B>(f: fn(A) -> ~[B]);
}

impl<A> ~[A]: vec_monad<A> {
    fn bind<B>(f: fn(A) -> ~[B]) {
        let mut r = fail;
        for self.each |elt| { r += f(*elt); }
        //~^ WARNING unreachable expression
        //~^^ ERROR the type of this value must be known
   }
}
fn main() {
    ["hi"].bind({|x| [x] }); //~ ERROR type `[&static/str]/1` does not implement any method in scope named `bind`
}