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