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//@ check-pass
//! Accept lifetime extensions of un-exercised lifetimes.
#![feature(transmutability, core_intrinsics)]
use std::mem::{Assume, TransmuteFrom};
unsafe fn transmute<Src, Dst>(src: Src) -> Dst
where
Dst: TransmuteFrom<Src, { Assume::SAFETY }>,
{
core::intrinsics::transmute_unchecked(src)
}
enum Void {}
mod phantom {
use super::*;
use std::marker::PhantomData;
fn extend_bare<'a>(src: PhantomData<&'a u8>) -> PhantomData<&'static u8> {
unsafe { transmute(src) }
}
}
mod tuple {
use super::*;
fn extend_pair<'a>(src: (&'a u8, Void)) -> (&'static u8, Void) {
unsafe { transmute(src) }
}
}
mod r#struct {
use super::*;
struct Struct<'a>(&'a u8, Void);
fn extend_struct<'a>(src: Struct<'a>) -> Struct<'static> {
unsafe { transmute(src) }
}
}
mod r#enum {
use super::*;
enum Single<'a> {
A(&'a u8, Void),
}
fn extend_single<'a>(src: Single<'a>) -> Single<'static> {
unsafe { transmute(src) }
}
enum Multi<'a> {
A(&'a u8, Void),
B,
C,
}
fn extend_multi<'a>(src: Multi<'a>) -> Multi<'static> {
unsafe { transmute(src) }
}
}
fn main() {}
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