47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright 2015 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.
|
|
|
|
// "guessing" in trait selection can affect `copy_or_move`. Check that this
|
|
// is correctly handled. I am not sure what is the "correct" behaviour,
|
|
// but we should at least not ICE.
|
|
|
|
use std::mem;
|
|
|
|
struct U([u8; 1337]);
|
|
|
|
struct S<'a,T:'a>(&'a T);
|
|
impl<'a, T> Clone for S<'a, T> { fn clone(&self) -> Self { S(self.0) } }
|
|
/// This impl triggers inference "guessing" - S<_>: Copy => _ = U
|
|
impl<'a> Copy for S<'a, Option<U>> {}
|
|
|
|
fn assert_impls_fn<R,T: Fn()->R>(_: &T){}
|
|
|
|
fn main() {
|
|
let n = None;
|
|
let e = S(&n);
|
|
let f = || {
|
|
// S being copy is critical for this to work
|
|
drop(e);
|
|
mem::size_of_val(e.0)
|
|
};
|
|
assert_impls_fn(&f);
|
|
assert_eq!(f(), 1337+1);
|
|
|
|
assert_eq!((|| {
|
|
// S being Copy is not critical here, but
|
|
// we check it anyway.
|
|
let n = None;
|
|
let e = S(&n);
|
|
let ret = mem::size_of_val(e.0);
|
|
drop(e);
|
|
ret
|
|
})(), 1337+1);
|
|
}
|