src/test/compile-fail/recursion_limit.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Test that the recursion limit can be changed. In this case, we have
  12 // deeply nested types that will fail the `Send` check by overflow
  13 // when the recursion limit is set very low.
  14
  15 #![allow(dead_code)]
  16 #![recursion_limit="10"]
  17
  18 macro_rules! link {
  19     ($id:ident, $t:ty) => {
  20         enum $id { $id($t) }
  21     }
  22 }
  23
  24 link! { A, B }
  25 link! { B, C }
  26 link! { C, D }
  27 link! { D, E }
  28 link! { E, F }
  29 link! { F, G }
  30 link! { G, H }
  31 link! { H, I }
  32 link! { I, J }
  33 link! { J, K }
  34 link! { K, L }
  35 link! { L, M }
  36 link! { M, N }
  37
  38 enum N { N(usize) }
  39
  40 fn is_send<T:Send>() { }
  41
  42 fn main() {
  43     is_send::<A>();
  44     //~^ ERROR overflow evaluating
  45     //~| NOTE consider adding a `#![recursion_limit="20"]` attribute to your crate
  46     //~| NOTE required because it appears within the type `A`
  47     //~| NOTE required because it appears within the type `B`
  48     //~| NOTE required because it appears within the type `C`
  49     //~| NOTE required because it appears within the type `D`
  50     //~| NOTE required because it appears within the type `E`
  51     //~| NOTE required because it appears within the type `F`
  52     //~| NOTE required because it appears within the type `G`
  53     //~| NOTE required because it appears within the type `H`
  54     //~| NOTE required because it appears within the type `I`
  55     //~| NOTE required because it appears within the type `J`
  56     //~| NOTE required by `is_send`
  57 }