[rustc.git] / src / test / ui / transmutability / unions / should_reject_disjoint.rs

//! Validity must be satisfiable, even if validity is assumed.

#![crate_type = "lib"]
#![feature(transmutability)]
#![allow(dead_code, incomplete_features, non_camel_case_types)]

mod assert {
    use std::mem::{Assume, BikeshedIntrinsicFrom};
    pub struct Context;

    pub fn is_maybe_transmutable<Src, Dst>()
    where
        Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY.and(Assume::VALIDITY) }>
    {}
}

#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 }
#[derive(Clone, Copy)] #[repr(u8)] enum Ox01 { V = 0x01 }
#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF }

fn test() {
    #[repr(C)]
    union A {
        a: Ox00,
        b: OxFF,
    }

    #[repr(C)]
    union B {
        c: Ox01,
    }

    assert::is_maybe_transmutable::<A, B>(); //~ ERROR cannot be safely transmuted
    assert::is_maybe_transmutable::<B, A>(); //~ ERROR cannot be safely transmuted
}
Commit	Line	Data
064997fb FG	1	//! Validity must be satisfiable, even if validity is assumed.
	2
	3	#![crate_type = "lib"]
	4	#![feature(transmutability)]
	5	#![allow(dead_code, incomplete_features, non_camel_case_types)]
	6
	7	mod assert {
f2b60f7d	8	use std::mem::{Assume, BikeshedIntrinsicFrom};
064997fb FG	9	pub struct Context;
	10
	11	pub fn is_maybe_transmutable<Src, Dst>()
	12	where
f2b60f7d	13	Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY.and(Assume::VALIDITY) }>
064997fb FG	14	{}
	15	}
	16
	17	#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 }
	18	#[derive(Clone, Copy)] #[repr(u8)] enum Ox01 { V = 0x01 }
	19	#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF }
	20
	21	fn test() {
	22	#[repr(C)]
	23	union A {
	24	a: Ox00,
	25	b: OxFF,
	26	}
	27
	28	#[repr(C)]
	29	union B {
	30	c: Ox01,
	31	}
	32
	33	assert::is_maybe_transmutable::<A, B>(); //~ ERROR cannot be safely transmuted
	34	assert::is_maybe_transmutable::<B, A>(); //~ ERROR cannot be safely transmuted
	35	}