src/test/compile-fail/region-object-lifetime-in-coercion.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 attempts to implicitly coerce a value into an
  12 // object respect the lifetime bound on the object type.
  13
  14 #![feature(box_syntax)]
  15
  16 trait Foo {}
  17 impl<'a> Foo for &'a [u8] {}
  18
  19 fn a(v: &[u8]) -> Box<Foo + 'static> {
  20     let x: Box<Foo + 'static> = box v; //~ ERROR declared lifetime bound not satisfied
  21     x
  22 }
  23
  24 fn b(v: &[u8]) -> Box<Foo + 'static> {
  25     box v //~ ERROR declared lifetime bound not satisfied
  26 }
  27
  28 fn c(v: &[u8]) -> Box<Foo> {
  29     box v // OK thanks to lifetime elision
  30 }
  31
  32 fn d<'a,'b>(v: &'a [u8]) -> Box<Foo+'b> {
  33     box v //~ ERROR declared lifetime bound not satisfied
  34 }
  35
  36 fn e<'a:'b,'b>(v: &'a [u8]) -> Box<Foo+'b> {
  37     box v // OK, thanks to 'a:'b
  38 }
  39
  40 fn main() { }