f46eabb9e5
Add an obligation cause for these error so that the error points to the implementations that caused the error.
51 lines
1.0 KiB
Rust
51 lines
1.0 KiB
Rust
// Regression test for #79457.
|
|
|
|
#![feature(min_specialization)]
|
|
|
|
use std::any::Any;
|
|
|
|
pub trait Tr {
|
|
fn method(self) -> Box<dyn Any + 'static>;
|
|
fn other(self);
|
|
}
|
|
|
|
impl<T: Any + 'static> Tr for T {
|
|
default fn method(self) -> Box<dyn Any + 'static> {
|
|
Box::new(self)
|
|
}
|
|
|
|
default fn other(self) {}
|
|
}
|
|
|
|
impl<'a> Tr for &'a i32 {
|
|
//~^ ERROR does not fulfill the required lifetime
|
|
fn other(self) {}
|
|
}
|
|
|
|
fn promote_to_static<'a>(i: &'a i32) -> &'static i32 {
|
|
*i.method().downcast().unwrap()
|
|
}
|
|
|
|
struct Wrapper<'a>(&'a i32);
|
|
|
|
impl<'a> Tr for Wrapper<'a> {
|
|
//~^ ERROR does not fulfill the required lifetime
|
|
fn other(self) {}
|
|
}
|
|
|
|
fn promote_to_static_2<'a>(w: Wrapper<'a>) -> Wrapper<'static> {
|
|
*w.method().downcast().unwrap()
|
|
}
|
|
|
|
fn main() {
|
|
let i = Box::new(100_i32);
|
|
let static_i: &'static i32 = promote_to_static(&*i);
|
|
drop(i);
|
|
println!("{}", *static_i);
|
|
|
|
let j = Box::new(200_i32);
|
|
let static_w: Wrapper<'static> = promote_to_static_2(Wrapper(&*j));
|
|
drop(j);
|
|
println!("{}", *static_w.0);
|
|
}
|