46 lines
940 B
Rust
46 lines
940 B
Rust
|
//@ check-pass
|
||
|
|
//
|
||
|
|
// Check that computing the lub works even for empty binders.
|
||
|
|
fn lt<'a: 'a>() -> &'a () {
|
||
|
|
&()
|
||
|
|
}
|
||
|
|
|
||
|
|
fn lt_in_fn<'a: 'a>() -> fn(&'a ()) {
|
||
|
|
|_| ()
|
||
|
|
}
|
||
|
|
|
||
|
|
struct Contra<'a>(fn(&'a ()));
|
||
|
|
fn lt_in_contra<'a: 'a>() -> Contra<'a> {
|
||
|
|
Contra(|_| ())
|
||
|
|
}
|
||
|
|
|
||
|
|
fn ok<'a, 'b, 'upper, 'lower>(v: bool)
|
||
|
|
where
|
||
|
|
'upper: 'a,
|
||
|
|
'upper: 'b,
|
||
|
|
'a: 'lower,
|
||
|
|
'b: 'lower,
|
||
|
|
|
||
|
|
{
|
||
|
|
let _: &'lower () = match v {
|
||
|
|
true => lt::<'a>(),
|
||
|
|
false => lt::<'b>(),
|
||
|
|
};
|
||
|
|
|
||
|
|
// This errored in the past because LUB and GLB always
|
||
|
|
// bailed out when encountering binders, even if they were
|
||
|
|
// empty.
|
||
|
|
let _: fn(&'upper ()) = match v {
|
||
|
|
true => lt_in_fn::<'a>(),
|
||
|
|
false => lt_in_fn::<'b>(),
|
||
|
|
};
|
||
|
|
|
||
|
|
// This was already accepted, as relate didn't encounter any binders.
|
||
|
|
let _: Contra<'upper> = match v {
|
||
|
|
true => lt_in_contra::<'a>(),
|
||
|
|
false => lt_in_contra::<'b>(),
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {}
|