src/test/compile-fail/issue-35139.rs

   1 // Copyright 2016 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 use std::fmt;
  12
  13 pub trait MethodType {
  14     type GetProp: ?Sized;
  15 }
  16
  17 pub struct MTFn;
  18
  19 impl<'a> MethodType for MTFn { //~ ERROR E0207
  20                                //~| NOTE unconstrained lifetime parameter
  21     type GetProp = fmt::Debug + 'a;
  22 }
  23
  24 fn bad(a: Box<<MTFn as MethodType>::GetProp>) -> Box<fmt::Debug+'static> {
  25     a
  26 }
  27
  28 fn dangling(a: &str) -> Box<fmt::Debug> {
  29     bad(Box::new(a))
  30 }
  31
  32 fn main() {
  33     let mut s = "hello".to_string();
  34     let x = dangling(&s);
  35     s = String::new();
  36     println!("{:?}", x);
  37 }