mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 09:14:20 +00:00
23 lines
506 B
Rust
23 lines
506 B
Rust
// Test that `dyn ?Sized` (i.e., a trait object with only a maybe buond) is not allowed, when just
|
|
// `?Sized` results from trait alias expansion.
|
|
|
|
#![feature(trait_alias)]
|
|
|
|
trait S = ?Sized;
|
|
|
|
// Nest a couple of levels deep:
|
|
trait _0 = S;
|
|
trait _1 = _0;
|
|
|
|
// Straight list expansion:
|
|
type _T0 = dyn _1;
|
|
//~^ ERROR at least one trait is required for an object type [E0224]
|
|
|
|
// Twice:
|
|
trait _2 = _1 + _1;
|
|
|
|
type _T1 = dyn _2;
|
|
//~^ ERROR at least one trait is required for an object type [E0224]
|
|
|
|
fn main() {}
|