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#![feature(rustc_attrs)]
#![feature(staged_api)]
#![stable(feature = "a", since = "1.0.0")]
#[rustc_promotable]
#[stable(feature = "a", since = "1.0.0")]
#[rustc_const_stable(feature = "a", since = "1.0.0")]
pub const fn id<T>(x: &'static T) -> &'static T { x }
#[rustc_promotable]
#[stable(feature = "a", since = "1.0.0")]
#[rustc_const_stable(feature = "a", since = "1.0.0")]
pub const fn new_string() -> String {
String::new()
}
#[rustc_promotable]
#[stable(feature = "a", since = "1.0.0")]
#[rustc_const_stable(feature = "a", since = "1.0.0")]
pub const fn new_manually_drop<T>(t: T) -> std::mem::ManuallyDrop<T> {
std::mem::ManuallyDrop::new(t)
}
const C: () = {
let _: &'static _ = &id(&new_string());
//~^ ERROR destructor of `String` cannot be evaluated at compile-time
};
const _: () = {
let _: &'static _ = &new_manually_drop(new_string());
//~^ ERROR: temporary value dropped while borrowed
};
fn main() {
let _: &'static _ = &id(&new_string());
//~^ ERROR: temporary value dropped while borrowed
//~| ERROR: temporary value dropped while borrowed
let _: &'static _ = &new_manually_drop(new_string());
//~^ ERROR: temporary value dropped while borrowed
}
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