56 lines
997 B
Rust
56 lines
997 B
Rust
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 covariance<'a, 'b, 'upper>(v: bool)
|
|
where
|
|
'upper: 'a,
|
|
'upper: 'b,
|
|
|
|
{
|
|
let _: &'upper () = match v {
|
|
//~^ ERROR lifetime may not live long enough
|
|
//~| ERROR lifetime may not live long enough
|
|
true => lt::<'a>(),
|
|
false => lt::<'b>(),
|
|
};
|
|
}
|
|
|
|
fn contra_fn<'a, 'b, 'lower>(v: bool)
|
|
where
|
|
'a: 'lower,
|
|
'b: 'lower,
|
|
|
|
{
|
|
|
|
let _: fn(&'lower ()) = match v {
|
|
//~^ ERROR lifetime may not live long enough
|
|
true => lt_in_fn::<'a>(),
|
|
false => lt_in_fn::<'b>(),
|
|
};
|
|
}
|
|
|
|
fn contra_struct<'a, 'b, 'lower>(v: bool)
|
|
where
|
|
'a: 'lower,
|
|
'b: 'lower,
|
|
|
|
{
|
|
let _: Contra<'lower> = match v {
|
|
//~^ ERROR lifetime may not live long enough
|
|
true => lt_in_contra::<'a>(),
|
|
false => lt_in_contra::<'b>(),
|
|
};
|
|
}
|
|
|
|
fn main() {}
|