| // Copyright 2017 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. |
| |
| fn prove_static<T: 'static + ?Sized>(_: &'static T) {} |
| |
| fn lifetime_transmute_slice<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T { |
| let mut out = [x]; |
| { |
| let slice: &mut [_] = &mut out; |
| slice[0] = y; |
| } |
| out[0] |
| //~^ ERROR 19:5: 19:11: explicit lifetime required in the type of `y` [E0621] |
| } |
| |
| struct Struct<T, U: ?Sized> { |
| head: T, |
| _tail: U |
| } |
| |
| fn lifetime_transmute_struct<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T { |
| let mut out = Struct { head: x, _tail: [()] }; |
| { |
| let dst: &mut Struct<_, [()]> = &mut out; |
| dst.head = y; |
| } |
| out.head |
| //~^ ERROR 34:5: 34:13: explicit lifetime required in the type of `y` [E0621] |
| } |
| |
| fn main() { |
| prove_static(lifetime_transmute_slice("", &String::from("foo"))); |
| prove_static(lifetime_transmute_struct("", &String::from("bar"))); |
| } |