rust/tests/ui/traits/pointee-tail-is-generic-errors.rs
2023-01-11 09:32:08 +00:00

23 lines
474 B
Rust

// edition:2018
#![feature(ptr_metadata)]
#![feature(type_alias_impl_trait)]
type Opaque = impl std::fmt::Debug + ?Sized;
fn opaque() -> &'static Opaque {
&[1] as &[i32]
}
fn a<T: ?Sized>() {
is_thin::<T>();
//~^ ERROR type mismatch resolving `<T as Pointee>::Metadata == ()`
is_thin::<Opaque>();
//~^ ERROR type mismatch resolving `<Opaque as Pointee>::Metadata == ()`
}
fn is_thin<T: std::ptr::Pointee<Metadata = ()> + ?Sized>() {}
fn main() {}