rust/src/test/compile-fail/recursion_limit.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 the recursion limit can be changed. In this case, we have
// deeply nested types that will fail the `Send` check by overflow
// when the recursion limit is set very low.

#![feature(macro_rules)]
#![allow(dead_code)]
#![recursion_limit="10"]

macro_rules! link {
    ($id:ident, $t:ty) => {
        enum $id { $id($t) }
    }
}

link!(A,B)
link!(B,C)
link!(C,D)
link!(D,E)
link!(E,F)
link!(F,G)
link!(G,H)
link!(H,I)
link!(I,J)
link!(J,K)
link!(K,L)
link!(L,M)
link!(M,N)

enum N { N(uint) }

fn is_send<T:Send>() { }

fn main() {
    is_send::<A>();
    //~^ ERROR overflow evaluating
    //~^^ NOTE consider adding a `#![recursion_limit="20"]` attribute to your crate
    //~^^^ NOTE required by `is_send`
    //~^^^^ ERROR overflow evaluating
    //~^^^^^ NOTE consider adding a `#![recursion_limit="20"]` attribute to your crate
    //~^^^^^^ NOTE required by `is_send`
}