[rustc.git] / src / test / ui / rfc1445 / cant-hide-behind-doubly-indirect-embedded.rs

// This is part of a set of tests exploring the different ways a
// structural-match ADT might try to hold a
// non-structural-match in hidden manner that lets matches
// through that we had intended to reject.
//
// See discussion on rust-lang/rust#62307 and rust-lang/rust#62339
#![warn(indirect_structural_match)]
// run-pass

struct NoDerive(i32);

// This impl makes NoDerive irreflexive.
impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }

impl Eq for NoDerive { }

#[derive(PartialEq, Eq)]
struct WrapInline<'a>(&'a &'a NoDerive);

const WRAP_DOUBLY_INDIRECT_INLINE: & &WrapInline = & &WrapInline(& & NoDerive(0));

fn main() {
    match WRAP_DOUBLY_INDIRECT_INLINE {
        WRAP_DOUBLY_INDIRECT_INLINE => { panic!("WRAP_DOUBLY_INDIRECT_INLINE matched itself"); }
        //~^ WARN must be annotated with `#[derive(PartialEq, Eq)]`
        //~| WARN this was previously accepted
        _ => { println!("WRAP_DOUBLY_INDIRECT_INLINE correctly did not match itself"); }
    }
}
Commit	Line	Data
416331ca	1	// This is part of a set of tests exploring the different ways a
ba9703b0 XL	2	// structural-match ADT might try to hold a
ba9703b0 XL	3	// non-structural-match in hidden manner that lets matches
416331ca XL	4	// through that we had intended to reject.
	5	//
	6	// See discussion on rust-lang/rust#62307 and rust-lang/rust#62339
	7	#![warn(indirect_structural_match)]
	8	// run-pass
	9
	10	struct NoDerive(i32);
	11
	12	// This impl makes NoDerive irreflexive.
	13	impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
	14
	15	impl Eq for NoDerive { }
	16
	17	#[derive(PartialEq, Eq)]
	18	struct WrapInline<'a>(&'a &'a NoDerive);
	19
	20	const WRAP_DOUBLY_INDIRECT_INLINE: & &WrapInline = & &WrapInline(& & NoDerive(0));
	21
	22	fn main() {
	23	match WRAP_DOUBLY_INDIRECT_INLINE {
	24	WRAP_DOUBLY_INDIRECT_INLINE => { panic!("WRAP_DOUBLY_INDIRECT_INLINE matched itself"); }
	25	//~^ WARN must be annotated with `#[derive(PartialEq, Eq)]`
1b1a35ee	26	//~\| WARN this was previously accepted
416331ca XL	27	_ => { println!("WRAP_DOUBLY_INDIRECT_INLINE correctly did not match itself"); }
	28	}
	29	}