[rustc.git] / src / test / ui / rfc-1445-restrict-constants-in-patterns / allow-hide-behind-indirect-unsafe-ptr-embedded.rs

// Test explores how `#[structral_match]` behaves in tandem with
// `*const` and `*mut` pointers.

// run-pass

#![warn(pointer_structural_match)]

struct NoDerive(#[allow(unused_tuple_struct_fields)] i32);

// This impl makes NoDerive irreflexive
// (which doesn't matter here because `<*const T>::eq` won't recur on `T`).
impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }

impl Eq for NoDerive { }

#[derive(PartialEq, Eq)]
struct WrapEmbedded(*const NoDerive);

const WRAP_UNSAFE_EMBEDDED: & &WrapEmbedded = & &WrapEmbedded(std::ptr::null());

fn main() {
    match WRAP_UNSAFE_EMBEDDED {
        WRAP_UNSAFE_EMBEDDED => { println!("WRAP_UNSAFE_EMBEDDED correctly matched itself"); }
        _ => { panic!("WRAP_UNSAFE_EMBEDDED did not match itself"); }
    }
}
Commit	Line	Data
416331ca XL	1	// Test explores how `#[structral_match]` behaves in tandem with
	2	// `const` and `mut` pointers.
	3
	4	// run-pass
	5
1b1a35ee XL	6	#![warn(pointer_structural_match)]
1b1a35ee XL	7
064997fb	8	struct NoDerive(#[allow(unused_tuple_struct_fields)] i32);
416331ca XL	9
	10	// This impl makes NoDerive irreflexive
	11	// (which doesn't matter here because `<*const T>::eq` won't recur on `T`).
	12	impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
	13
	14	impl Eq for NoDerive { }
	15
	16	#[derive(PartialEq, Eq)]
	17	struct WrapEmbedded(*const NoDerive);
	18
	19	const WRAP_UNSAFE_EMBEDDED: & &WrapEmbedded = & &WrapEmbedded(std::ptr::null());
	20
	21	fn main() {
	22	match WRAP_UNSAFE_EMBEDDED {
	23	WRAP_UNSAFE_EMBEDDED => { println!("WRAP_UNSAFE_EMBEDDED correctly matched itself"); }
	24	_ => { panic!("WRAP_UNSAFE_EMBEDDED did not match itself"); }
	25	}
	26	}