33 lines
943 B
Rust
33 lines
943 B
Rust
// compile-flags:-Zborrowck=mir
|
|
|
|
#![feature(member_constraints)]
|
|
// revisions: min_tait full_tait
|
|
#![feature(min_type_alias_impl_trait)]
|
|
#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
|
|
//[full_tait]~^ WARN incomplete
|
|
|
|
#[derive(Clone)]
|
|
struct CopyIfEq<T, U>(T, U);
|
|
|
|
impl<T: Copy> Copy for CopyIfEq<T, T> {}
|
|
|
|
type E<'a, 'b> = impl Sized;
|
|
|
|
fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
|
|
//~^ ERROR hidden type for `impl Trait` captures lifetime that does not appear in bounds
|
|
let v = CopyIfEq::<*mut _, *mut _>(&mut { x }, &mut y);
|
|
|
|
// This assignment requires that `x` and `y` have the same type due to the
|
|
// `Copy` impl. The reason why we are using a copy to create a constraint
|
|
// is that only borrow checking (not regionck in type checking) enforces
|
|
// this bound.
|
|
let u = v;
|
|
let _: *mut &'a i32 = u.1;
|
|
unsafe {
|
|
let _: &'b i32 = *u.0;
|
|
}
|
|
u.0
|
|
}
|
|
|
|
fn main() {}
|