src/test/compile-fail/lifetime-bound-will-change-warning.rs

   1 // Copyright 2012 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 // aux-build:lifetime_bound_will_change_warning_lib.rs
  12
  13 // Test that various corner cases cause an error. These are tests
  14 // that used to pass before we tweaked object defaults.
  15
  16 #![allow(dead_code)]
  17 #![allow(unused_variables)]
  18 #![feature(rustc_attrs)]
  19
  20 extern crate lifetime_bound_will_change_warning_lib as lib;
  21
  22 fn just_ref(x: &Fn()) {
  23 }
  24
  25 fn ref_obj(x: &Box<Fn()>) {
  26     // this will change to &Box<Fn()+'static>...
  27
  28     // Note: no warning is issued here, because the type of `x` will change to 'static
  29     if false { ref_obj(x); }
  30 }
  31
  32 fn test1<'a>(x: &'a Box<Fn()+'a>) {
  33     // just_ref will stay the same.
  34     just_ref(&**x)
  35 }
  36
  37 fn test1cc<'a>(x: &'a Box<Fn()+'a>) {
  38     // same as test1, but cross-crate
  39     lib::just_ref(&**x)
  40 }
  41
  42 fn test2<'a>(x: &'a Box<Fn()+'a>) {
  43     // but ref_obj will not, so warn.
  44     ref_obj(x) //~ ERROR mismatched types
  45 }
  46
  47 fn test2cc<'a>(x: &'a Box<Fn()+'a>) {
  48     // same as test2, but cross crate
  49     lib::ref_obj(x) //~ ERROR mismatched types
  50 }
  51
  52 fn test3<'a>(x: &'a Box<Fn()+'static>) {
  53     // here, we have a 'static bound, so even when ref_obj changes, no error results
  54     ref_obj(x)
  55 }
  56
  57 fn test3cc<'a>(x: &'a Box<Fn()+'static>) {
  58     // same as test3, but cross crate
  59     lib::ref_obj(x)
  60 }
  61
  62 #[rustc_error]
  63 fn main() {
  64 }