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#![feature(trait_upcasting)]
trait Foo<'a>: Bar<'a, 'a> {}
trait Bar<'a, 'b> {
fn get_b(&self) -> Option<&'a u32> {
None
}
}
fn test_correct(x: &dyn Foo<'static>) {
let _ = x as &dyn Bar<'static, 'static>;
}
fn test_correct2<'a>(x: &dyn Foo<'a>) {
let _ = x as &dyn Bar<'_, '_>;
}
fn test_wrong1<'a>(x: &dyn Foo<'static>, y: &'a u32) {
let _ = x as &dyn Bar<'static, 'a>; // Error
//~^ ERROR lifetime may not live long enough
}
fn test_wrong2<'a>(x: &dyn Foo<'static>, y: &'a u32) {
let _ = x as &dyn Bar<'a, 'static>; // Error
//~^ ERROR lifetime may not live long enough
}
fn test_wrong3<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
let y = x as &dyn Bar<'_, '_>;
y.get_b() // ERROR
//~^ ERROR lifetime may not live long enough
}
fn test_wrong4<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
<_ as Bar>::get_b(x) // ERROR
//~^ ERROR lifetime may not live long enough
}
fn test_wrong5<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
<_ as Bar<'_, '_>>::get_b(x) // ERROR
//~^ ERROR lifetime may not live long enough
}
fn test_wrong6<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
let y = x as &dyn Bar<'_, '_>;
y.get_b(); // ERROR
let z = y;
z.get_b() // ERROR
//~^ ERROR lifetime may not live long enough
}
fn main() {}
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